# Class 9 Maths Sample Paper 2022-23

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CBSE class 9 Maths sample paper 2022-23 has both subjective and objective type questions. Especially you will find all case studies in subjective format. Unlike class 10 there is only one course in class 9 Mathematics. All students will study the same course content. You can download the model question paper for class 9 maths from myCBSEguide App or our student dashboard for free.

## Sample Paper of class 9 Math – in PDF

CBSE sample question papers (solved) class 9 Mathematics is released for session 2022-23.  CBSE, New Delhi has issued the new marking scheme and blueprint for Class 9 Mathematics. We are providing Mathematics guess papers for Class 9 annual examinations 2023. These sample question papers are available for free download in the myCBSEguide app and website in PDF format. CBSE Sample Papers for class 9 Mathematics with solutions will certainly help students to score high in exams.

Sample Papers of Class 12 maths 2023 with solution

## CBSE Sample Papers Class 9 Mathematics

As discussed, CBSE does not conduct board exams for class 9 students. It is purely a home exam. But schools have to follow the guidelines issued by CBSE while preparing the question paper. It is necessary to assure uniformity in terms of difficulty level and format of the question paper.

In most cases, the CBSE examination portal provides question papers and schools download them from CBSE official website only.

## Class 09 – Mathematics Sample Paper – 01 (2022-23)

Maximum Marks: 80
Time Allowed: : 3 hours

General Instructions:

1. This Question Paper has 5 Sections A-E.
2. Section A has 20 MCQs carrying 1 mark each.
3. Section B has 5 questions carrying 02 marks each.
4. Section C has 6 questions carrying 03 marks each.
5. Section D has 4 questions carrying 05 marks each.
6. Section E has 3 case based integrated units of assessment (04 marks each) with subparts of the values of 1, 1 and 2 marks each respectively.
7. All Questions are compulsory. However, an internal choice in 2 Qs of 5 marks, 2 Qs of 3 marks and 2 Questions of 2 marks has been provided. An internal choice has been provided in the 2marks questions of Section E.
8. Draw neat figures wherever required. Take π =22/7 wherever required if not stated.

1. ### Class 9 Maths Sample Paper Section A

2. The abscissa of a point is the distance of the point from
a) None of these
b) origin
c) x-axis
d) y-axis
3. The measure of each side of an equilateral triangle whose area is {tex}\sqrt{3}{/tex} cm2 is
a) 8 cm
b) 4 cm
c) 2 cm
d) 16 cm
4. If a chord of a circle is equal to its radius, then the angle subtended by this chord in major segment is
a) 30o
b) 90o
c) 45o
d) 60o
5. The graph given below shows the frequency distribution of the age of 22 teachers in a school. The number of teachers whose age is less than 40 years is

a) 17
b) 16
c) 15
d) 14

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6. After rationalising the denominator of {tex}\frac{7}{3 \sqrt{3}-2 \sqrt{2}}{/tex}, we get the denominator as
a) 5
b) 35
c) 19
d) 13
7. If two acute angles of a right triangle are equal, then each acute is equal to
a) 45°
b) 60°
c) 30°
d) 90°
8. Any solution of the linear equation 2x + 0y + 9 = 0 in two variables is of the form
a) {tex}\left(-\frac{9}{2}, m\right){/tex}
b) (-9 , 0)
c) {tex}\left(0,-\frac{9}{2}\right){/tex}
d) {tex}\left(n,-\frac{9}{2}\right){/tex}
9. If {tex}x-\frac{1}{x}=\frac{15}{4}{/tex}, then {tex}x+\frac{1}{x}{/tex} =
a) 4
b) {tex}\frac{1}{4}{/tex}
c) {tex}\frac{17}{4}{/tex}
d) {tex}\frac{13}{4}{/tex}
10. The value of {tex}\left(\frac{256 x^{16}}{81 y^{4}}\right)^{-\frac{1}{4}} {/tex} is
a) {tex}\frac{4 y}{5 x^{4}}{/tex}
b) {tex}\frac{3 y}{4 x^{4}}{/tex}
c) {tex}\frac{4 x^{4}}{3 y}{/tex}
d) {tex}\frac{3 y}{8 x^{4}}{/tex}
11. The opposite sides of a quadrilateral have
a) two common points
b) no common point
c) one common point
d) infinitely many common points
12. If {tex}\sqrt{13-a \sqrt{10}}=\sqrt{8}+\sqrt{5}{/tex}, then a =
a) -5
b) -2
c) -4
d) -6
13. Express y in terms of x in the equation 5y – 3x – 10 = 0.
a) {tex}y = \frac{{3 – 10x}}{5}{/tex}
b) {tex}y = \frac{{3 + 10x}}{5}{/tex}
c) {tex}y = \frac{{3x – 10}}{5}{/tex}
d) {tex}y = \frac{{3x + 10}}{5}{/tex}
14. Two angles measure (70 + 2x)o and (3x – 15)o. If each angle is the supplement of the other, then the value of x is :
a) 30
b) 20
c) 250{tex}^0{/tex}
d) 25
15. {tex}\frac{125}{216}^\frac{-1}{3}{/tex} =
a) {tex}{6 \over 5}{/tex}
b) 125
c) {tex}{5 \over 6}{/tex}
d) 216
16. In the given figure ABCD and ABEF are cyclic quadrilaterals. If {tex}\angle{/tex}BCD = 110o then {tex}\angle{/tex}BEF = ?

a) 90o
b) 70o
c) 55o
d) 110o
17. Point (- 10,0) lies
a) on the negative direction of the y-axis
b) on the negative direction of the X-axis
18. Every linear equation in two variables has
a) two solutions
b) no solution
c) an infinite number of solutions
d) one solution
19. (x + 1) is a factor of the polynomial
a) x3 + x2 – x + 1
b) x3 + x2 + x + 1
c) x4 + 3x3 + 3x2 + x + 1
d) x4 + x3 + x2 + 1
20. Assertion (A): If the diagonals of a parallelogram ABCD are equal, then {tex}\angle{/tex}ABC = 90o
Reason (R): If the diagonals of a parallelogram are equal, it becomes a rectangle.

a) Both A and R are true and R is the correct explanation of A.
b) Both A and R are true but R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.
21. Assertion (A): The rationalised form of {tex}\frac {1}{\sqrt{7}-2}{/tex} is {tex}\sqrt 7{/tex} + 2.
Reason (R): The conjugate of {tex}\sqrt 7{/tex} – 2 is {tex}\sqrt 7{/tex} + 2.

a) Both A and R are true and R is the correct explanation of A.
b) Both A and R are true but R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.
22. ### Class 9 Maths Sample Paper Section B

23. Solve the equation a – 15 = 25 and state which axiom do you use here.
24. It is known that x + y = 10 and that x = z. Show that z + y = 10?
25. Write the co-ordinates of each of the following points marked in the graph paper.
26. Simplify : 22/ 3. 21/5

OR

If {tex}a = \frac { 3 + \sqrt { 5 } } { 2 }{/tex}, then find the value of {tex}a ^ { 2 } + \frac { 1 } { a ^ { 2 } }{/tex}.

27. Harish was a student of 9th class. Once his birthday party was arranged in a restaurant. He got a playing top (lattu) as his birthday present, which surprisingly had no color on
it. He wanted to color it with his crayons. The top is shaped like a cone surmounted by a hemisphere as shown in the figure. The entire top of each lattu is 5 cm in height and the diameter of the top is 3.5 cm. Rashid wants to color the hemispherical part by red color and the conical part by green color.

1. What is the area to be colored by red color?
2. Also, find the area to be colored by green color.

OR

Find the ratio of the curved surface areas of two cones if their diameters of the bases are equal and slant heights are in the ratio 4 : 3.

28. ### Class 9 Maths Sample Paper Section C

29. If a = xyp-1, b = xyq-1 and c = xyr-1, prove that aq-r br-p cp-q = 1
30. Construct a histogram for the following data:
 Monthly School fee (in ₹): 30-60 60-90 90-120 120-150 150-180 180-210 210-240 No of Schools 5 12 14 18 10 9 4
31. In Figure  AD and BE are medians of  {tex}\Delta{/tex}ABC and BE || DF. Prove that CF = {tex}\frac { 1 } { 4 }{/tex} AC.
32. Find at least 3 solutions for the following linear equation in two variables:
2x + 5y = 13
33. Draw a histogram of the following distribution:
 Height (in cm) Number of students 150 – 153 7 153 – 156 8 156 – 159 14 159 – 162 10 162 – 165 6 165 – 168 5

OR

The production of oil (in lakh tonnes) in some of the refineries in India during 1982 was given below:

 Refinery: Barauni Koyali Mathura Mumbai Florida Production of oil (in lakh tonnes) 30 70 40 45 25

Construct a bar graph to represent the above data so that the bars are drawn horizontally.

34. Factorize: {tex}2 \sqrt{2} x^{3}+3 \sqrt{3} y^{3}+\sqrt{5}(5-3 \sqrt{6} x y){/tex}
35. ### Class 9 Maths Sample Paper Section D

36. In the given figure, AB {tex}\parallel{/tex} CD. Find the value of x{tex}^\circ{/tex}

OR

In the given figure, l || m and a transversal t cuts them. If {tex}\angle 1 : \angle 2=2 : 3{/tex}, find the measure of each of the marked angles.

37. A right angled triangle with sides 3 cm and 4 cm is revolved around its hypotenuse. Find the volume of the double cone thus generated.
38. Find the area of the triangle whose sides are 42 cm, 34 cm and 20 cm in length. Hence, find the height corresponding to the longest side.

OR

The perimeter of a triangle is 50 cm. One side of a triangle is 4 cm longer than the smaller side and the third side is 6 cm less than twice the smaller side. Find the area of the triangle.

39. Let R1 and R2 are the remainders when the polynomials x3 + 2x2 – 5ax – 7 and x3+ ax2– 12x + 6 are divided by x + 1 and x – 2 respectively. If 2R+ R2 = 6 , find the value of a.
40. ### Class 9 Maths Sample Paper Section E

Peter, Kevin James, Reeta and Veena were students of Class 9th B at Govt Sr Sec School, Sector 5, Gurgaon.
Once the teacher told Peter to think a number x and to Kevin to think another number y so that the difference of the numbers is 10 (x > y).
Now the teacher asked James to add double of Peter’s number and that three times of Kevin’s number, the total was found 120.
Reeta just entered in the class, she did not know any number.
The teacher said Reeta to form the 1st equation with two variables x and y.
Now Veena just entered the class so the teacher told her to form 2nd equation with two variables x and y.
Now teacher Told Reeta to find the values of x and y. Peter and kelvin were told to verify the numbers x and y.

1. What are the equation formed by Reeta and Veena?
2. What was the equation formed by Veena?
3. Which number did Peter think?
4. OR

Which number did Kelvin think?

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In the middle of the city, there was a park ABCD  in the form of a parallelogram form so that  AB = CD, AB||CD and AD = BC, AD || BC.
Municipality converted this park into a rectangular form by adding land in the form of {tex}\Delta{/tex}APD and {tex}\Delta{/tex} BCQ. Both the triangular shape of land were covered by planting flower plants.

1. Show that {tex}\Delta{/tex}APD and {tex}\Delta{/tex}BQC are congruent.
2. PD is equal to which side?
3. OR

What is the value of {tex}\angle{/tex}m?

4. Show that {tex}\Delta{/tex}ABC and {tex}\Delta{/tex}CDA are congruent.
Mr. Vivekananda purchased a plot QRUT to build his house. He leaves space of two congruent semicircles for gardening and a rectangular area of breadth 3 cm for car parking.

1. Find the total area of Garden.
2. Find the area of rectangle left for car parking.
3. OR

Find the area of a semi-circle.

4. Find the radius of semi-circle.

## Class 09 – Mathematics Sample Paper (Solution)

Solution

1. ### Class 9 Maths Solution Section A

2. (d) y-axis
Explanation: y-axis
3. (c) 2 cm
Explanation: Area of equilateral triangle = {tex}\frac{\sqrt{3}a^2}{4}{/tex} where a = side of the triangle
{tex}\sqrt{3}{/tex} = {tex}\frac{\sqrt{3}a^2}{4}{/tex}
Solving
a2 = 4
a = 2 cm
4. (a) 30o
Explanation: Since the chord is equal to the radius therefore, it will form an equilateral triangle inside the circle with the third vertex being the centre of the circle.
So the chord will make an angle of 60o at the centre. As the angle made by the chord at any other point of the circumference would be half.
So, we have that angle made at the major segment would be 30o.
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5. (c) 15
Explanation: Add the values corresponding to the height of the bar before 40.
6 + 3 + 4 + 2 = 15
6. (c) 19
Explanation: After rationalizing:
{tex}\frac{7}{3 \sqrt{3}-2 \sqrt{2}}=\frac{7}{3 \sqrt{3}-2 \sqrt{2}} \times \frac{3 \sqrt{3}+2 \sqrt{2}}{3 \sqrt{3}+2 \sqrt{2}}{/tex}
{tex}\frac{7(3 \sqrt{3}+2 \sqrt{2})}{(3 \sqrt{3})^{2}-(2\sqrt{2})^{2}}{/tex}
{tex}\frac{7(3 \sqrt{3}+2 \sqrt{2})}{27-8} {/tex}
{tex}\frac{7(3 \sqrt{3}+2 \sqrt{2})}{19} {/tex}
7. (a) 45°
Explanation: Let the measure of each acute angle of a triangle be x°.
Then, we have
x° + x° + 90° = 180°
i.e. 2x° = 90°
i.e. x° = 45°
8. (a) {tex}\left(-\frac{9}{2}, m\right){/tex}
Explanation: 2x + 9 = 0
{tex}\Rightarrow x = \frac{-9}{2}{/tex} and y = m, where m is any real number
Hence, {tex}\left(-\frac{9}{2}, m\right){/tex}  is the solution of the given equation.
9. (c) {tex}\frac{17}{4}{/tex}
Explanation: {tex}\Rightarrow{/tex} {tex}x-\frac{1}{x}=\frac{15}{4}{/tex}
Now , {tex}\left(x-\frac{1}{x}\right)^{2}=\left(\frac{15}{4}\right)^{2}{/tex}
{tex}\Rightarrow{/tex}{tex}\left(x^{2}\right)+\left(\frac{1}{x^{2}}\right)-2{/tex}{tex}\times x \times \frac{1}{x}{/tex}{tex}=\frac{225}{16}{/tex}
{tex}\Rightarrow{/tex}{tex}\left(x^{2}\right)+\left(\frac{1}{x^{2}}\right){/tex}{tex}=\frac{225}{16}+2{/tex}
{tex}\Rightarrow{/tex}{tex}\left(x^{2}\right)+\left(\frac{1}{x^{2}}\right){/tex}{tex}=\frac{257}{16}{/tex}
{tex}\Rightarrow{/tex} {tex}\left(x^{2}\right)+\left(\frac{1}{x^{2}}\right)+2{/tex}{tex}\times x \times \frac{1}{x}{/tex}{tex}=\frac{257}{16}+2{/tex}{tex}\times x \times \frac{1}{x}{/tex}
{tex}\Rightarrow{/tex}{tex}\left(x+\frac{1}{x}\right)^{2}{/tex}{tex}=\frac{257+32}{16}=\frac{289}{16}{/tex}
{tex}\Rightarrow{/tex}{tex}\left(x+\frac{1}{x}\right)={/tex}{tex}\sqrt{\frac{289}{16}}=\frac{17}{4}{/tex}
10. (b) {tex}\frac{3 y}{4 x^{4}}{/tex}
Explanation: {tex}\left(\frac{256 x^{16}}{81 y^{4}}\right)^{-\frac{1}{4}} {/tex}
{tex}\left(\frac{81 y^{4}}{256 x^{16}}\right)^{\frac{1}{4}} {/tex}
={tex}\left(\frac{3^4 y^{4}}{4^4 x^{16}}\right)^{\frac{1}{4}} {/tex}
{tex}[\left(\frac{3y}{4 x^{4}}\right)^4]^{\frac{1}{4}} {/tex}
{tex}\left(\frac{3y}{4 x^{4}}\right)^{{\frac{1}{4}} \times4}{/tex}
=  {tex}\frac{3 y}{4 x^{4}}{/tex}
11. (b) no common point
Explanation: We can look at a quadrilateral as:
The opposite sides of the above quadrilateral AB and CD have no point in common.
12. (c) -4
Explanation: {tex}\sqrt{13-a \sqrt{10}}=\sqrt{8}+\sqrt{5}{/tex}
Squaring both sides we get,
{tex}(\sqrt{13-a \sqrt{10}})^2 {/tex} = {tex}(\sqrt{8}+\sqrt{5})^2 {/tex}
{tex}\Rightarrow{/tex}{tex}13-a \sqrt{10}{/tex} = 8 + 5+ 2 {tex}(\sqrt{8})(\sqrt{5}) {/tex}
{tex}\Rightarrow{/tex} 13 – a{tex}\sqrt{10}{/tex} = 13 + 2{tex}\sqrt{40}{/tex}
{tex}\Rightarrow{/tex} -a{tex}\sqrt{10}{/tex} = 2(2{tex}\sqrt{10}{/tex})
{tex}\Rightarrow{/tex} -a{tex}\sqrt{10}{/tex} = 4 {tex}\sqrt{10}{/tex}
{tex}\Rightarrow{/tex} a = -4
13. (d) {tex}y = \frac{{3x + 10}}{5}{/tex}
Explanation: 5y – 3x – 10 = 0
5y – 3x = 10
5y = 10 + 3x
y = {tex}\frac{10+3 x}{5}{/tex}
14. (d) 25
Explanation: 70 + 2x + 3x – 15 = 180 (Supplimentary angles)
5x = 180 – 55
x = 25
15. (a) {tex}{6 \over 5}{/tex}
Explanation: {tex}\frac{125}{216}^\frac{-1}{3}{/tex}
{tex}\frac{5}{6}^{3\times\frac{-1}{3}}{/tex}
{tex}\frac{5}{6}^{-1}{/tex} = {tex}\frac{6}{5}{/tex}
16. (d) 110o
Explanation: Given: ABCD, ABEF are two cyclic quadrilaterals and {tex}\angle{/tex}BCD = 110o
We know that,
In a cyclic quadrilateral opposite angles are supplementary
{tex}\therefore \angle B C D+\angle B A D=180^{\circ}{/tex}
{tex}110^{\circ}+\angle B A D=180^{\circ}{/tex}
{tex}\angle B A D=180^{\circ}-110^{\circ}=70^{\circ}{/tex}
{tex}70^{\circ}+\angle B E F=180^{\circ}{/tex}
{tex}\angle \mathrm{BEF}{/tex} = 180o – 70o = 110o
{tex}\therefore \angle B E F=110^{\circ}{/tex}
17. (b) on the negative direction of the X-axis
Explanation: In point (-10, 0) y-coordinate is zero, so it lies on X-axis and its x-coordinate is negative, so the point (-10, 0) lies on the X-axis in the negative direction.
18. (c) an infinite number of solutions
Explanation: A linear equation in two variables is of the form, ax + by + c = 0, where geometrically it does represent a straight line and every point on this graph is a solution for a given linear equation.
As a line consists of an infinite number of points. A linear equation has an infinite number of solutions.
19. (b) x3 + x2 + x + 1
Explanation: P(x) = x3 + x2 + x + 1
P(-1) = (-1)3 + (-1)2 + (-1) + 1
= -1 + 1 – 1 + 1 = 0
20. (a) Both A and R are true and R is the correct explanation of A.
Explanation: Both A and R are true and R is the correct explanation of A.
21. (d) A is false but R is true.
Explanation: The rationalised form of {tex}\frac {1}{\sqrt{7}-2}{/tex} is {tex}\frac{\sqrt{7}+2}{3}{/tex}..
22. ### Class 9 Maths Solution Section B

23. We have,
a – 15 = 25.
On adding 15 to both sides, we have
a – 15 + 15 = 25 + 15 = 40 (using Euclid’s second axiom).or a = 40
24. We are given that,
x + y = 10 …(i)
and x = z …(ii)
According to Euclid’s axioms, if equals are added to equals, the wholes are equal.
Therefore, From Eq.(ii),
x + y = z + y …(iii)
From Equations (i) and (iii)
z + y = 10.
25. A(3, 1), B(6, 0), C(0, 6), D(–3, 0), E(–4, 3), F(–2, –4), G(0, –5), H(3, –6), P(7, –3), Q(7, 6).
26. 22/3. 21/5 = 22/3 + 1/5  = 2{tex}\frac{10+3}{15}{/tex} = 2{tex}\frac{13}{15}{/tex}

OR

Given, {tex}a = \frac { 3 + \sqrt { 5 } } { 2 }{/tex}
{tex}\Rightarrow a ^ { 2 } = \frac { ( 3 + \sqrt { 5 } ) ^ { 2 } } { 4 }{/tex}  {tex}[\because ( a + b ) ^ { 2 } = a ^ { 2 } + b ^ { 2 } + 2 a b]{/tex}
{tex}= \frac { 9 + 5 + 6 \sqrt { 5 } } { 4 } \\= \frac { 14 + 6 \sqrt { 5 } } { 4 } \\= \frac { 7 + 3 \sqrt { 5 } } { 2 }{/tex}
Now, {tex}\frac { 1 } { a ^ { 2 } } = \frac { 2 } { 7 + 3 \sqrt { 5 } } = \frac { 2 } { 7 + 3 \sqrt { 5 } } \times \frac { 7 – 3 \sqrt { 5 } } { 7 – 3 \sqrt { 5 } }{/tex}
{tex}= \frac { 2 ( 7 – 3 \sqrt { 5 } ) } { ( 7 ) ^ { 2 } – ( 3 \sqrt { 5 } ) ^ { 2 } }{/tex} {tex}[\because \left( a ^ { 2 } – b ^ { 2 } \right) = ( a + b ) ( a – b )]{/tex}
{tex}= \frac { 2 ( 7 – 3 \sqrt { 5 } ) } { 49 – 45 }\\ = \frac { 2 ( 7 – 3 \sqrt { 5 } ) } { 4 } \\= \frac { 7 – 3 \sqrt { 5 } } { 2 }{/tex}
{tex}\therefore a ^ { 2 } + \frac { 1 } { a ^ { 2 } } = \frac { 7 + 3 \sqrt { 5 } } { 2 } + \frac { 7 – 3 \sqrt { 5 } } { 2 }{/tex}
{tex}= \frac { 7 + 3 \sqrt { 5 } + 7 – 3 \sqrt { 5 } } { 2 } = \frac { 14 } { 2 } = 7{/tex}

1. Diameter of hemispherical part = 3.5 cm
r = 3.5/2 = 1.75 cm
TSA = {tex}2{\pi}r^2 = 2\times\frac{22}7\times1.75\times1.75{/tex} = 19.25 cm2
Hence area to be colored by red color = 19.25 cm2
2. From the figure,
height of cone h = total height – 1.75 = 5 – 1.75 = 3.25 cm
r = 1.75 cm
Slant height l = {tex}\sqrt{\mathrm r^2+\mathrm h^2}{/tex}
= {tex}\sqrt{{(1.75)}^2+{(3.25)}^2}{/tex}
= 3.7 cm (approx)
Hence area to be colored by green color = {tex}\pi rl{/tex} = 3.14{tex}\times{/tex}1.75{tex}\times{/tex}3.7 = 20.35 cm2

OR

Since diameter of two cones are equal
{tex}\therefore{/tex} r1 = r2 = r (say)
Let ratio be x,
{tex}\therefore{/tex} Slant height ‘l1‘ of 1st cone = 4x
Similarly, slant height ‘l2‘ of 2nd cone = 3x
{tex}\therefore{/tex} {tex}\frac { C . S . A _ { 1 } } { C . S . A _ { 2 } } = \frac { \pi r _ { 1 } l _ { 1 } } { \pi r _ { 2 } l _ { 2 } } = \frac { \pi \times r \times 4 x } { \pi \times r \times 3 x } = \frac { 4 } { 3 }{/tex}

27. ### Class 9 Maths Solution Section C

28. a = xyp-x, b = xyq-1 and c = xyr-1
{tex}\therefore{/tex} aq-r {tex}\times{/tex} br-p {tex}\times{/tex} cp-q
= (xyp-x)q-r {tex}\times{/tex} (xyq-1)r-p {tex}\times{/tex} (xyr-1)p-q
= xq-r {tex} \times {/tex} y(p-1)(q-r) {tex} \times {/tex} xr-p {tex} \times {/tex} y(q-1)(r-p) {tex} \times {/tex} xp-q {tex} \times {/tex} y(r-1)(p-q)
= xq-r{tex} \times {/tex}xr-p  {tex} \times {/tex}xp-q{tex} \times {/tex}ypq-pr-q+r {tex} \times {/tex}qr-pq-r+p   {tex} \times {/tex}pr-qr-p+q
= xq-r+r-p+p-q {tex} \times {/tex}p q-p r-q+r+q r-p q-r+p+p r-q r-p+q
= x0 {tex} \times {/tex} y0
= 1 {tex} \times {/tex}1
= 1
29. REQUIRED GRAPH

30. Consider the triangle ABC.
AD and BE are the medians of the triangle.
Thus, D is the midpoint of the side BC and E is the midpoint of the side AC.
Therefore, CD = {tex}\frac{BC}{2}{/tex} and CE = {tex}\frac{AC}{2}{/tex}    ….(i)
Consider {tex}\Delta{/tex}BEC,
Given that DF || BE, therefore, F is the midpoint of CE.
i.e. CF = {tex}\frac{CE}{2}{/tex}
{tex}\frac{1}{2}[\frac{AC}{2}]{/tex} [From eq. (i)] = {tex}\frac{AC}{4}{/tex}
i.e. CF = {tex}\frac{AC}{4}{/tex}
Hence proved.
31. 2x + 5y = 13
⇒ 5y = 13 – 2x
{tex}y={13-2x\over5}{/tex}
Put x = 0, then {tex}y={13-2(0)\over5}={13\over5}{/tex}
Put x = 1, then {tex}y={13-2(1)\over5}={11\over5}{/tex}
Put x = 2, then{tex}y={13-2(2)\over5}={9\over5}{/tex}
Put x = 3, then{tex}y={13-2(3)\over5}={7\over5}{/tex}
{tex}(0,{13\over5}),(1,{11\over5}),(2,{9\over5})\ and\ (3,{7\over5}){/tex}are the solutions of the equation 2x + 5y = 13.
32. Histogram which represent the given frequency distribution is shown below:

OR

The production of oil (in lakh tonnes) in some of the refineries in India during 1982

33. We have,
{tex}2 \sqrt{2} x^{3}+3 \sqrt{3} y^{3}+\sqrt{5}(5-3 \sqrt{6} x y){/tex}
{tex}=2 \sqrt{2} x^{3}+3 \sqrt{3} y^{3}+5 \sqrt{5}-3 \sqrt{5} \times \sqrt{6} x y{/tex}
{tex}=(\sqrt{2} x)^{3}+(\sqrt{3} y)^{3}+(\sqrt{5})^{3}-3 \times(\sqrt{2} x)(\sqrt{3} y)(\sqrt{5}){/tex}
Using a3 + b3 + c3 – 3abc = (a+b+c) (a2 + b+ c2 – ab – bc – ca)
{tex}=(\sqrt{2} x+\sqrt{3} y+\sqrt{5})\left(2 x^{2}+3 y^{2}+5-\sqrt{2} x \times \sqrt{3} y-\sqrt{3} y \times \sqrt{5}-\sqrt{5} \times \sqrt{2} x\right){/tex}
{tex}=(\sqrt{2} x+\sqrt{3} y+\sqrt{5})\left(2 x^{2}+3 y^{2}+5-\sqrt{6} x y-\sqrt{15} y-\sqrt{10} x\right){/tex}
34. ### Class 9 Maths Solution Section D

35. Draw EF {tex}\parallel{/tex} AB {tex}\parallel{/tex} CD
EF {tex}\parallel{/tex} CD and CE is the transversal
Then,
{tex}\angle E C D+\angle C E F=180^{\circ}{/tex}
[Angles on the same side of a transversal line are supplementary] {tex}\Rightarrow 130^{\circ}+\angle C E F=180^{\circ}{/tex}
{tex}\Rightarrow \angle C E F=50^{\circ}{/tex}
Again EF {tex}\parallel{/tex} AB and AE is the transversal
Then,
{tex}\angle B A E+\angle A E F=180^{\circ}{/tex} [Angles on the same side of a transversal line are supplementary] {tex}\Rightarrow{/tex}{tex}\angle B A E+\angle{/tex}AEC + {tex}\angle{/tex}CEF = 180{tex}^\circ{/tex} {tex}[\angle A E F=\angle A E C+\angle C E F]{/tex}
{tex}\Rightarrow{/tex} x° + 20° + 50° = 180°
{tex}\Rightarrow{/tex} x{tex}^\circ{/tex} + 170° = 180°
{tex}\Rightarrow{/tex} x{tex}^\circ{/tex} = 110°

OR

Given that {tex}\angle 1 : \angle 2{/tex} = 2 : 3
Let {tex}\angle{/tex}1 = 2k and {tex}\angle{/tex}2 = 3k, where k is some constant
Now, {tex}\angle{/tex}1 and {tex}\angle{/tex}2 form a linear pair
{tex}\therefore \angle 1+\angle 2=180^{\circ}{/tex}
{tex}\Rightarrow 2 k+3 k=180^{\circ}{/tex}
{tex}\Rightarrow 5 k=180^{\circ}{/tex}
{tex}\Rightarrow k=36^{\circ}{/tex}
{tex}\therefore \angle 1=2 k=2 \times 36^{\circ}=72^{\circ}{/tex}
{tex}\angle 2=3 k=3 \times 36^{\circ}=108^{\circ}{/tex}
Now,
{tex}\angle 3=\angle 1=72^{\circ}{/tex}  (Vertically opposite angles)
{tex}\angle 4=\angle 2=108^{\circ}{/tex} (Vertically opposite angles)
It is given that, l {tex}\parallel{/tex} m and t is a transversal
{tex}\therefore \angle 5=\angle 1=72^{\circ}{/tex}   (Pair of corresponding angles)
{tex}\angle 6=\angle 2=108^{\circ}{/tex}  (Pair of corresponding angles)
{tex}\angle 7=\angle 1=72^{\circ}{/tex} (Pair of alternate exterior angles)
{tex}\angle 8=\angle 2=108^{\circ}{/tex} (Pair of alternate exterior angles)
{tex}\angle {/tex}1 = {tex}\angle {/tex}3 = {tex}\angle {/tex}5={tex}\angle {/tex}7 = 72{tex}^\circ{/tex}
and {tex}\angle {/tex}2 = {tex}\angle {/tex}4 = {tex}\angle {/tex}6={tex}\angle {/tex}8 = 108{tex}^\circ{/tex}

36. AB = 3 cm, AC = 4 cm
In {tex}\triangle{/tex}BAC, by pythagoras theorem
BC2 = AB2 + AC2
{tex}\Rightarrow{/tex}BC2 = 32 + 42
{tex}\Rightarrow{/tex}BC2 = 25
{tex}\Rightarrow{/tex}BC = {tex}\sqrt {25} {/tex} = 5 cm
In {tex}\triangle{/tex}AOB and {tex}\triangle{/tex}CAB
{tex}\angle{/tex}ABO = {tex}\angle{/tex}ABC [common] {tex}\angle{/tex}AOB = {tex}\angle{/tex}BAC [each 90o] Then, {tex}\triangle{/tex}AOB – {tex}\triangle{/tex}CAB [by AA similarity] {tex}\therefore{/tex} {tex}\frac { A O } { C A } = \frac { O B } { A B } = \frac { A B } { C B }{/tex} [c.p.s.t] {tex}\Rightarrow{/tex} {tex}\frac { A O } { 4 } = \frac { O B } { 3 } = \frac { 3 } { 5 }{/tex}
Then, AO = {tex}\frac{{4 \times 3}}{5}{/tex} and OB = {tex}\frac{{3 \times 3}}{5}{/tex}
{tex}\Rightarrow{/tex} AO = {tex}\frac{12}{5}{/tex} cm and OB = {tex}\frac{9}{5}{/tex} cm
{tex}\therefore{/tex}OC = 5 – {tex}\frac{9}{5}{/tex} = {tex}\frac{16}{5}{/tex}cm
{tex}\therefore{/tex} Volume of double cone thus generated = volume of first cone + volume of second cone
{tex}= \frac { 1 } { 3 } \pi ( A O ) ^ { 2 } \times B O + \frac { 1 } { 3 } \pi ( A O ) ^ { 2 } \times O C{/tex}
{tex}= \frac { 1 } { 3 } \times \frac { 22 } { 7 } \times \left( \frac { 12 } { 5 } \right) ^ { 2 } \times \frac { 9 } { 5 } + \frac { 1 } { 3 } \times \frac { 22 } { 7 } \times \left( \frac { 12 } { 5 } \right) ^ { 2 } \times \frac { 16 } { 5 }{/tex}
{tex}= \frac { 1 } { 3 } \times \frac { 22 } { 7 } \times \frac { 12 } { 5 } \times \frac { 12 } { 5 } \left[ \frac { 9 } { 5 } + \frac { 16 } { 5 } \right]{/tex}
{tex}= \frac { 1 } { 3 } \times \frac { 22 } { 7 } \times \frac { 12 } { 5 } \times \frac { 12 } { 5 } \times 5{/tex}
={tex}\frac{1056}{35}{/tex} = {tex}30 \frac { 6 } { 35 } \mathrm { cm } ^ { 3 }{/tex}.
37. Let: a = 42 cm, b = 34 cm and c = 20 cm
{tex}\therefore s=\frac{a+b+c}{2}{/tex}{tex}=\frac{42+34+20}{2}=48 \mathrm{cm}{/tex}
By Heron’s formula, we have:
Area of triangle {tex}=\sqrt{s(s-a)(s-b)(s-c)}{/tex}
{tex}=\sqrt{48(48-42)(48-34)(48-20)}{/tex}
{tex}=\sqrt{48 \times 6 \times 14 \times 28}{/tex}
{tex}=\sqrt{4 \times 2 \times 6 \times 6 \times 7 \times 2 \times 7 \times 4}{/tex}
{tex}=4 \times 2 \times 6 \times 7{/tex}
Area of triangle = 336 cm2
We know that the longest side is 42 cm.
Thus, we can find out the height of the triangle corresponding to 42 cm.
We have: Area of triangle = 336 cm2
{tex}\Rightarrow \frac{1}{2} \times{/tex} Base {tex}\times{/tex} Height = 336
{tex}\Rightarrow{/tex} {tex}\frac 1 2{/tex} (42)(height) = 336
{tex}\Rightarrow{/tex} Height {tex}=\frac{336 \times 2}{42}{/tex} = 16 cm

OR

Let the smaller side of the triangle be x cm. therefore, the second side will be (x + 4) cm, and third side is (2x – 6) cm.
Now, perimeter of triangle = x (x + 4) + (2x – 6)
= (4x – 2) cm
Also, perimeter of triangle = 50 cm.
4x = 52; x = 52 ÷ 4 = 13
Therefore, the three sides are 13 cm, 17 cm, 20 cm
{tex}s = \frac{{13 + 17 + 20}}{2} = \frac{{50}}{2} = 25cm{/tex}
{tex}\therefore{/tex} Area of {tex}\Delta = \sqrt {25(25 – 13)(25 – 17)(25 – 20)}{/tex}
{tex} = \sqrt {25 \times 12 \times 8 \times 5} = \sqrt {5 \times 5 \times 4 \times 3 \times 4 \times 2 \times 5} {/tex}
{tex} = 5 \times 4 \times \sqrt {3 \times 2 \times 5} = 20\sqrt {30} c{m^2}{/tex}

38. Let p(x) = x3 + 2x2 – 5ax- 7 and q(x) = x3 + ax2 – 12x + 6 be the given polynomials.
Now, R1 = Remainder when p(x) is divided by x + 1
{tex}\Rightarrow{/tex} R1 = p(-1)
{tex}\Rightarrow{/tex} R= (-1)3 + 2(-1)2 – 5a {tex}\times{/tex} (-1) – 7
{tex}\Rightarrow{/tex} R1 = -1 + 2 + 5a – 7
{tex}\Rightarrow{/tex} R1 = 5a – 6
And, R2 = Remainder when q(x) is divided by x – 2
{tex}\Rightarrow{/tex} R2 = q(2)
{tex}\Rightarrow{/tex} R2 = 23 + a {tex}\times{/tex}22 – 12 {tex}\times{/tex} 2 + 6
{tex}\Rightarrow{/tex} R2 = 8 + 4a – 24 + 6
{tex}\Rightarrow{/tex} R2 = 4a – 10
Substituting the values of Rand R2 in 2R1+ R2 = 6, we get
2(5a – 6) + (4a -10) = 6
{tex}\Rightarrow{/tex} 10a – 12 + 4a – 10 = 6
{tex}\Rightarrow{/tex} 14a – 22 = 6 {tex}\Rightarrow{/tex} 14a = 28 {tex}\Rightarrow{/tex} a = 2
39. ### Class 9 Maths Solution Section E

1. x – y = 10
2x + 3y = 120
2. 2x + 3y = 120
3. x – y = 10 …(1)
2x + 3y = 120 …(2)
Multiply equation (1) by 3 and to equation (2)
3x – 3y + 2x + 3y = 30 + 120
{tex}\Rightarrow{/tex} 5x = 150
{tex}\Rightarrow{/tex} x = 30
Hence the number thought by Prateek is 30.
4. OR

We know that ​​​​​x – y = 10 …(i) and 2x + 3y = 120 …(ii)
Put x = 30 in equation (i)
30 – y = 10
{tex}\Rightarrow{/tex} y = 40
Hence number thought by Kevin = 40

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1. In {tex}\triangle{/tex}APD and {tex}\triangle{/tex}BQC
AP = CQ (opposite sides of rectangle)
{tex}\angle{/tex}APD = {tex}\angle{/tex}BQC = 90o
By RHS criteria {tex}\triangle{/tex}APD {tex}\cong{/tex} {tex}\triangle{/tex}CQB
2. {tex}\triangle{/tex}APD {tex}\cong{/tex} {tex}\triangle{/tex}CQB
Corresponding part of congruent triangle
side PD = side BQ
3. OR

In {tex}\triangle{/tex}APD
{tex}\Rightarrow{/tex} 90o + (180o – 110o) + {tex}\angle{/tex}ADP = 180o (angle sum property of {tex}\triangle{/tex})
{tex}\Rightarrow{/tex} {tex}\angle{/tex}ADP = m = 180o – 90o – 70o = 20o

4. In {tex}\triangle{/tex}ABC and {tex}\triangle{/tex}CDA
AB = CD (given)
AC = AC (common)
By SSS criteria {tex}\triangle{/tex}ABC {tex}\cong{/tex} {tex}\triangle{/tex}CDA
1. Area of Garden is  = 2 {tex}\times{/tex} semicircles
Area of a semi-circle = 2 {tex}\times{/tex} {tex}\frac 12 \pi{/tex}r2
= {tex}\frac {22}7 \times 6.75 \times6.75{/tex} = 144.43 cm2
2. Area of rectangle left for car parking is area of region PSUT = 27 {tex}\times{/tex} 3 = 81 cm2
3. OR

Diameter of semi-circle = PV = {tex}\frac {PS}2 = \frac {27}2{/tex} = 13.5 cm
{tex}\therefore{/tex} Radius of semi-circle = {tex}\frac {13.5}2{/tex} = 6.75 cm
Area of a semi-circle = {tex}\frac 12 \pi{/tex}r2
{tex}\frac 12\times \frac {22}7 \times 6.75 \times {/tex} 6.75 = 71.59 cm2

4. Diameter of semi-circle = PV = {tex}\frac {PS}2 = \frac {27}2{/tex} = 13.5 cm
{tex}\therefore{/tex} Radius of semi-circle = {tex}\frac {13.5}2{/tex} = 6.75 cm

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