CBSE > Class 09 > Mathematics | CBSE Board | Homework Help

=> angle A + angle B + angle C = 180°. => 1/2 ( angle A + angle B + angle C ) = 90°. => 1/2 angle B + 1/2 angle C = 90°- 1/2 angle A. => angle BOC + 1/2(angle B + angle C)= 180°. => angle BOC + 90° -1/2 angle A =180° => angle BOC = 180°- 90° + 1/2 angle A => angle BOC = 90° +1/2 angle A

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Does every equation in 2 variable have unique solution?

Posted by Niharika Gureja 4 years, 8 months ago

CBSE > Class 09 > Mathematics

2 answers

Dhammaratna Kamble 4 years, 8 months ago

noo

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Aarti Anand 4 years, 8 months ago

Nooooooooo.... It has infinitely many solutions.

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Chapter 1 roots questions

Posted by Sarita Maan 4 years, 8 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

Who is teacher of Pythagoras.

Posted by Prince Kumar 4 years, 8 months ago

CBSE > Class 09 > Mathematics

2 answers

Himani Kashyap 4 years, 8 months ago

?????

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Prashant Jinwal 4 years, 8 months ago

Pagal hai kya

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Surgace area of cuboid

Posted by Manpreet Singh 4 years, 8 months ago

CBSE > Class 09 > Mathematics

2 answers

Prashant Jinwal 4 years, 8 months ago

2(lb+bh+hl)

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Dj Jd 4 years, 8 months ago

2(lb+bh+hl)

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ANSWER

Factorise: x³+13x²+32x+20

Posted by Aushi Thakur 4 years, 8 months ago

CBSE > Class 09 > Mathematics

2 answers

Dj Jd 4 years, 8 months ago

(x+1)(x+2)(x+10)

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Pryash Vardhan 4 years, 8 months ago

f(x)=-1 (-1)

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leena had 4/8of a pizza left after her party.she gave 1/4to her friend .what fractional part did she left her self

Posted by Riya Resh 4 years, 8 months ago

CBSE > Class 09 > Mathematics

3 answers

Himani Kashyap 4 years, 8 months ago

Hadd h yaar aise questions kon puchta h k lalch ayy????

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Himani Kashyap 4 years, 8 months ago

Yes 2/4

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Prisha Gupta 4 years, 8 months ago

2/4 but not sure

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The perimeter of a right triangle is 24cm . If its hypotenuse is 10cm . Find its area?

Posted by Nakshathra S 4 years, 8 months ago

CBSE > Class 09 > Mathematics

4 answers

Dj Jd 4 years, 8 months ago

24cm^2

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Prashant Jinwal 4 years, 8 months ago

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Yogita Ingle 4 years, 8 months ago

Let ABC is a right angled triangle.

i) Perimeter of ∆ABC = 24

=> x+y+10=24

=> x+y = 24-10

=> x+y = 14 ---(1)

ii) By Phythagorean theorem:

AC²= AB²+BC²

=> 10²= x² + y²

=> x²+y² = 100 ---(2)

iii) On Squaring equation (1), we get

=> (x+y)² = 14²

=> x²+y²+2xy = 196

=> 100+2xy = 196( From (2) ]

=> 2xy = 196-100

=> 2xy = 96

Divide both sides by 2 , we get

=> xy = 48 ---(3)

Now ,

{tex}Area \: of \: \triangle ABC = \frac{1}{2} \times AB \times BC\\=\frac{1}{2}\times xy\\=\frac{1}{2}\times 48{/tex}

/* From (3) \

{tex}= 24\: cm^{2}{/tex}

Therefore,

{tex}Area \: of \: the\:triangle =24\: cm^{2}{/tex}

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Manpreet Singh 4 years, 8 months ago

0Thank You

ANSWER

Find the surface area of cube whose edge's is 25 m

Posted by Khushi Mittal 4 years, 8 months ago

CBSE > Class 09 > Mathematics

3 answers

Dj Jd 4 years, 8 months ago

3750 CM^2

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Aarti Anand 4 years, 8 months ago

6*25m^2 = 6*625m^2 = 3750m^2. Sorry but 18625 is wrong answer.

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Manpreet Singh 4 years, 8 months ago

18625

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Three boys rohit ,sameer,tarun are siting at equal distance each other on the boundary of circular garden the radius of circular garden is 14m find their distance from each other

Posted by Isha Chand 4 years, 8 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

Graph

Posted by Binoy Augustine 4 years, 8 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

In a triangle ABC if angle A +angle B = 65° and angle B + angle C =140°, then the measure of angle B is Options (a) 40° (b) 25° (c) 115° (d) 60°

Posted by S Vinay Kumar 4 years, 8 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

If its perimeter of an equilateral triangle is 180 , what will be its area ??

Posted by S Vinay Kumar 4 years, 8 months ago

CBSE > Class 09 > Mathematics

2 answers

Dj Jd 4 years, 8 months ago

900√3 cm^2

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Yogita Ingle 4 years, 8 months ago

{tex}Let\: side\: of \: an : equilateral \: triangle = a \: cm{/tex}

{tex}Perimeter \: of \: the \: triangle\ (P) = 180\:cm \: (given){/tex}

{tex}\implies 3a = 180\:cm{/tex}

{tex}\implies a = \frac{180}{3}{/tex}

{tex}\implies a = 60\:cm{/tex}

{tex}Area\: of \: an\ \: equilateral \: triangle (A) =\frac{\sqrt{3}}{4}\times a^{2}{/tex}

{tex}=\frac{\sqrt{3}}{4}\times 60^{2}\\=\frac{\sqrt{3}}{4}\times 60\times 60\\=\frac{\sqrt{3}}{4}\times 60\times 15\\=900\sqrt{3} \:cm^{2}{/tex}

Therefore,

{tex}Area\: of \ \: equilateral \: triangle (A)\ =900\sqrt{3}\:cm^{2}{/tex}

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X ki power 4+4

Posted by Muskan Jha 4 years, 8 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

In a triangle ABC if 2 angle A =3 angle B= 6 angle C , then measure of angle A is ??

Posted by S Vinay Kumar 4 years, 8 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

Prove that angles opposite to equal sides of an isoceles triangle are equal.

Posted by Saksham Khanna 4 years, 8 months ago

CBSE > Class 09 > Mathematics

2 answers

Nakshathra S 4 years, 8 months ago

Draw a triangle ABC . Draw AD as it's perpendicular bisector. Prove the congruency of the two triangles ( ABD and ACD )by SSS congruence rule. Then by CPCT (Corresponding Parts of Congruent Triangles ) angle ABC and angle ACD are equal. Hence proved that angles opposite to equal sides of an isosceles triangle are equal and vice versa.

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Jai Saxena 4 years, 8 months ago

Ad is the bisector angle a find the mesure of angle bad

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ch-10 circles all theorms solved

Posted by Garry Jagdev 4 years, 8 months ago

CBSE > Class 09 > Mathematics

1 answers

Gurnam Singh 4 years, 8 months ago

Cbse 9th March paper

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The circumference of the base of a cylinder is 22 CM if height is 7 cm then find its curved surface area

Posted by Jitendra Sharma 4 years, 8 months ago

CBSE > Class 09 > Mathematics

2 answers

Yogita Ingle 4 years, 8 months ago

Circumference of base of cylinder = 22 cm

Height of cylinder = 7 cm

So,

Circumference=2 πr = 22 Given

r= 22/2 π= 22(7)/2 (22) = 7/2 = 3.5

Radius of cylinder = 3.5 cm

∴ Curved surface area of cylinder = 2 π rh = 2× 22/7 × 3.5 × 7= 2 × 22/7 × 3.5 × 7 = 44 × 3.5 = 154 cm²

0Thank You

Jitendra Sharma 4 years, 8 months ago

154cm2

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The circumference of the base of a cylinder is 22 CM if it is 7 cm then find its curved surface area

Posted by Jitendra Sharma 4 years, 8 months ago

CBSE > Class 09 > Mathematics

2 answers

Dj Jd 4 years, 8 months ago

77 cm

0Thank You

Yogita Ingle 4 years, 8 months ago

Circumference of base of cylinder = 22 cm

Height of cylinder = 7 cm

So,

Circumference=2 πr = 22 Given

r= 22/2 π= 22(7)/2 (22) = 7/2 = 3.5

Radius of cylinder = 3.5 cm

∴ Curved surface area of cylinder = 2 π rh = 2× 22/7 × 3.5 × 7= 2 × 22/7 × 3.5 × 7 = 44 × 3.5 = 154 cm²

2Thank You

ANSWER

Euclid fifth postulate

Posted by Aryan Rana 4 years, 8 months ago

CBSE > Class 09 > Mathematics

2 answers

Yogita Ingle 4 years, 8 months ago

If a straight line falling on two straight lines makes the interior angles on the same side of it taken together less than two right angles, then the two straight lines, if produced indefinitely, meet on that side on which the sum of angles is less than two right angles.

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Jitendar Varma 4 years, 8 months ago

Sneha Verma

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Divide 1 by 7+3√2

Posted by Priti Pegu 4 years, 8 months ago

CBSE > Class 09 > Mathematics

1 answers

G P Singh 4 years, 8 months ago

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Factorise:- (p-q)3 + (q-r)3 + (r-p)3

Posted by Vanshika Arora 4 years, 8 months ago

CBSE > Class 09 > Mathematics

2 answers

Dj Jd 4 years, 8 months ago

3(p-q) (q-r) (r-p)

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Aarti Anand 4 years, 8 months ago

Taking (p-q) as a, (q-r) as b, and (r-p) as c, we have a+ b+c = p-q+q-r+r-p = 0. Also we know when a+b+c = 0 then a^3 + b^3 + c^3 = 3 abc. So, (p-q)^3+(q-r)^3+(r-p)^3 = 3 (p-q) (q-r) (r-p)

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Ad=bd=cd and find angle BAC

Posted by Vanshika Arora 4 years, 8 months ago

CBSE > Class 09 > Mathematics

2 answers

Anurag Kumar 4 years, 8 months ago

90°

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Dj Jd 4 years, 8 months ago

Figure

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Find two irrational number between under root 23 and 24 under root

Posted by Divya Singh 4 years, 8 months ago

CBSE > Class 09 > Mathematics

0 answers

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If x+y+z=0 then find the value of x×x+y×y+z×z

Posted by Abdullah Arif 4 years, 8 months ago

CBSE > Class 09 > Mathematics

2 answers

Dj Jd 4 years, 8 months ago

Yes answer is 0

0Thank You

Priyam Kumar 4 years, 8 months ago

1Thank You

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Find six rational number between 3 and 4

Posted by Yirs Li 4 years, 8 months ago

CBSE > Class 09 > Mathematics

6 answers

Adarsh Pal 4 years, 8 months ago

6+1 =7 3×7/7=21/7 4×7/7=28/7 22/7 ,23/7,24/7,25/7,26/7,27/7

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Priyam Kumar 4 years, 8 months ago

22,23,24,25,26,27.

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Arpit Singh 4 years, 8 months ago

I have ask one question

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Priyeta Manjari 4 years, 8 months ago

3×7=21,4×7=28 , 22,23,24,25,26,27

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Meet Jaiswal 4 years, 8 months ago

If you need to find six rational no. Then multiply 3*7/7=21/7 and 4*7/7=28/7 21/7 — 28/7 are the six rational numbers

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Manisha Jain 4 years, 8 months ago

Simple

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If the area of a parallelogram ABCD is 30 cm then the length of altitude AQ is

Posted by Harshit Kashyap 4 years, 8 months ago

CBSE > Class 09 > Mathematics

1 answers

Abhishek Sangale 4 years, 8 months ago

AQ =30÷b

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What is quadrilateral & types of quadilatetal ?

Posted by Naina Choudhary. 4 years, 8 months ago

CBSE > Class 09 > Mathematics

1 answers

Anamika Sharma 4 years, 8 months ago

A quadrilateral is a plane figure, it has four sides , for angles and four vertices . There are six types of quadrilateral: (1) Trapezium (2) Parallelogram (3) Rectangle (4) Rhombus (5) Square (6)Kite

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x√(x^2+1) degree of polynomial

Posted by Saurabh Pandey 4 years, 8 months ago

CBSE > Class 09 > Mathematics