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

1. The angles of quadrilateral are in the ratio 3 : 5 : 9 : 13. Find all the angles of the quadrilateral. Solution: Let the common ratio between the angles be = x. We know that the sum of the interior angles of the quadrilateral = 360° Now, 3x+5x+9x+13x = 360° ⇒ 30x = 360° ⇒ x = 12° , Angles of the quadrilateral are: 3x = 3×12° = 36° 5x = 5×12° = 60° 9x = 9×12° = 108° 13x = 13×12° = 156°

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Gaurav Seth 5 years, 4 months ago

1. The angles of quadrilateral are in the ratio 3 : 5 : 9 : 13. Find all the angles of the quadrilateral.

Solution:

Let the common ratio between the angles be = x.

We know that the sum of the interior angles of the quadrilateral = 360°

Now,

3x+5x+9x+13x = 360°

⇒ 30x = 360°

⇒ x = 12°

, Angles of the quadrilateral are:

3x = 3×12° = 36°

5x = 5×12° = 60°

9x = 9×12° = 108°

13x = 13×12° = 156°

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ANSWER

Classify the following as rational or irrational .........0.3796

Posted by M U 5 years, 4 months ago

CBSE > Class 09 > Mathematics

4 answers

Anjali Joshi 5 years, 4 months ago

Irrational

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Aaditya Mishra 5 years, 4 months ago

What's is polynomial

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M U 5 years, 4 months ago

proof

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Suraj Pratap 5 years, 4 months ago

Irrational number hai

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ANSWER

How?? to find three irrational no. Between 5/7 and 9/11.

Posted by M U 5 years, 4 months ago

CBSE > Class 09 > Mathematics

2 answers

M U 5 years, 4 months ago

Thanks a lot!!! ?

1Thank You

Gaurav Seth 5 years, 4 months ago

Let us convert 5/7 and 9/11 into decimal form, to get

5/7 = 0.714285... and 9/1 = 0.818181.... .

Three irrational numbers that lie between 0.714285.... and 0.818181.... are:

0.73073007300073….

0.74074007400074….

0.76076007600076….

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ANSWER

2a + 1 = 3 then a =

Posted by Shreyansh Sutariya 5 years, 4 months ago

CBSE > Class 09 > Mathematics

4 answers

Anjali Joshi 5 years, 4 months ago

Ans: 1

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Suraj Pratap 5 years, 4 months ago

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Kashak Jadav 5 years, 4 months ago

If, 2a+1=3 We want to find value of A 2a=3-1 2a=2 a=2/2 a=1 Value of a=1

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M U 5 years, 4 months ago

1.......let me proof = See 2a+1=3 ====2a=3-1=====2a=2=====a=2/2 by dividing it. We get, 1

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ANSWER

1+1 =

Posted by Shreyansh Sutariya 5 years, 4 months ago

CBSE > Class 09 > Mathematics

5 answers

Pragati Singh 5 years, 4 months ago

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Suraj Pratap 5 years, 4 months ago

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Manyata Joshi 5 years, 4 months ago

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M U 5 years, 4 months ago

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Shreyansh Sutariya 5 years, 4 months ago

1Thank You

ANSWER

Write coefficient of x^2 in the polynomial 5x^2+6x+3

Posted by Ayush Singh 5 years, 4 months ago

CBSE > Class 09 > Mathematics

3 answers

Anjali Joshi 5 years, 4 months ago

5 is cofficent

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Kashak Jadav 5 years, 4 months ago

In eqation 5x²+6x+3 coefficients is 5

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Trishla Jain 5 years, 4 months ago

5 is the coefficient of x² in the polynomial 5x²+6x+3

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ANSWER

How to find number between two irrational numbers

Posted by Sanjana Bharti 5 years, 4 months ago

CBSE > Class 09 > Mathematics

2 answers

M U 5 years, 4 months ago

This is just an example Let us convert 5/7 and 9/11 into decimal form, to get 5/7 = 0.714285... and 9/1 = 0.818181.... . Three irrational numbers that lie between 0.714285.... and 0.818181.... are: 0.73073007300073…. 0.74074007400074…. 0.76076007600076….

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Gaurav Seth 5 years, 4 months ago

Suppose we have two rational numbers a and b, then the irrational numbers between those two will be, √ab. Now let us find two irrational numbers between two given rational numbers.

1. Find an irrational number between two rational numbers 2 – √3 and 5 – √3

Let x be the irrational number between two rational numbers 2 – √3 and 5 – √3. Then we get,
2 – √3 < x < 5 – √3
⇒ 2 < x + < √3 < 5
We see that x + √3 is an irrational number between 2 – √3 and 5 – √3 where 2 – √3 < x < 5 – √3.

2. Find two irrational numbers between two given rational numbers.

Now let us take any two numbers, say a and b. Let x be any number between a and b. Then,
We have a < x < b….. let this be equation (1)
Now, subtract √2 from both the sides of equation (1)
So, a – √2 < x < b – √2……equation (2)
= a < x + √2 < b
Addition of irrational number with any number results into an irrational number. So, x + √2 is an irrational number which exists between two rational numbers a and b.

2Thank You

ANSWER

What is Constant polynomial

Posted by Tisha Rajour 5 years, 4 months ago

CBSE > Class 09 > Mathematics

3 answers

M U 5 years, 4 months ago

A polynomial with degree 0 is called a constant polynomial. Any constant number for example, 3, 4/5, 679, 8.34 are examples of constant polynomials.

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Yogita Ingle 5 years, 4 months ago

Constant Polynomials : An expression consisting of only constants is called as constant polynomial.
For Example: 7, -27, 3, etc. are some constant polynomials.

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Tisha Rajour 5 years, 4 months ago

Constant polynomial: A constant polynomial is of the form p(x) = k, where k is a real number. For example, –9, 10, 0 are constant polynomials.

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ANSWER

If AB ||CD,∆APQ=50°and ∆PRD=127°, find x and y.

Posted by Shashank Aryan 5 years, 4 months ago

CBSE > Class 09 > Mathematics

1 answers

Gaurav Seth 5 years, 4 months ago

Question 5. In Fig. 6.32, if AB || CD, ∠ APQ = 50° and ∠ PRD = 127°, find x and y.

Solution: Use property of Alternate interior angles
∠APR = ∠PRD
50° + y = 127°
y = 127° − 50°
y = 77°
use same property of Alternate interior angles
∠APQ = ∠PQR
50° = x
∠ x = 50° and y = 77°

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ANSWER

????? ?????? ?? ??????????

Posted by Chandn Singh 5 years, 4 months ago

CBSE > Class 09 > Mathematics

3 answers

Rut@J@ $Ingh 5 years, 4 months ago

False

2Thank You

Agnes Jimmy 5 years, 4 months ago

No ,this statement is wrong .numbers can be rational or irrational

2Thank You

Khushi Sawanliya 5 years, 4 months ago

No, it may be rational or irrational number

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ANSWER

If x raise to power 3 + x raise to power 2 into y raise to power 5 + y raise to power 2 + y ,then the highest degree is , and how?

Posted by Alka Yadav 5 years, 4 months ago

CBSE > Class 09 > Mathematics

1 answers

Saksham Tripathi 5 years, 4 months ago

Total votes results for the first 0000

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ANSWER

suppose a box of 10kg is moving towards north with velocity of 10m/s such that it has zero net force not a force of 20 n is exerted on it towards south what is the assertion produced and in which direction

Posted by Jashandeep Kaur 5 years, 4 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

Root 10 multiply with root 15

Posted by Anfal Pananghat 5 years, 4 months ago

CBSE > Class 09 > Mathematics

1 answers

Rashika Maithil 5 years, 4 months ago

22500

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ANSWER

Where did bepin Babu say he won in October 58

Posted by Abhinandan Dubey 5 years, 4 months ago

CBSE > Class 09 > Mathematics

3 answers

Shubham Singh 5 years, 4 months ago

Bepin Babu said that he spent the Durga Puja of October 1958 in Kanpur and he didn’t go to Ranchi at all. He went to Kanpur at his friend's Place in October '58'.

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Gaurav Seth 5 years, 4 months ago

Answer
Bepin Babu said that he spent the Durga Puja of October 1958 in Kanpur and he didn’t go to Ranchi at all.
He went to Kanpur at his friend's Place in October '58'.

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Samruddhi Khonde 5 years, 4 months ago

Kanpur

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ANSWER

√6(√3+2(

Posted by Karuna Mishra 5 years, 4 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

A triangle having sides a, b and c. If s-a=4cm, s-b=8 cm and s-c=12 cm, then find the value of a, b and c.

Posted by Ashmit Sharma 5 years, 4 months ago

CBSE > Class 09 > Mathematics

1 answers

Gaurav Seth 5 years, 4 months ago

Answer:

Sides of the triangle are 20 cm, 16 cm, 12 cm

Step-by-step explanation:

Formula used:

If a, b, c are sides of triangle then

s=(a+b+c)/2

Given:

s-a=4 cm

s-b=8 cm

s-c=12 cm

Adding these we get

s+s+s-a-b-c = 24

3s-(a+b+c) =24

3s-2s = 24

s = 24

Now,

s-a=4

24 - a =4

a = 24 - 4 = 20 cm

s-b=8

24 - b = 8

b = 24 - 8 = 16 cm

s - c = 12

24 - c = 12

c = 24 -12 = 12 cm

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ANSWER

If (2, 0) is a solution of the linear equation 2x + 3y = k, then the value of k is

Posted by Samruddhi Khonde 5 years, 4 months ago

CBSE > Class 09 > Mathematics

5 answers

Samruddhi Khonde 5 years, 4 months ago

Thanks for answer

1Thank You

Samruddhi Khonde 5 years, 4 months ago

No I'm not navodayan...and all

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Aarushi Erande 5 years, 4 months ago

•Putting x=2 and y=0 •We get 2×2 + 3×0 = k •So, 4 + 0= k • Hence the answer is, k=4

2Thank You

Satyam Gupta 5 years, 4 months ago

You are navodayan yes or not

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Satyam Gupta 5 years, 4 months ago

4 hoga

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ANSWER

The cost of a notebook is twice the cost of pen. Write a linear equation in two variable to represent this statement

Posted by Vandana Bari 5 years, 4 months ago

CBSE > Class 09 > Mathematics

5 answers

Khushi Sawanliya 5 years, 4 months ago

Let the cost of notebooks is x And the cost of pen is y So , The linear equation is x = 2y

1Thank You

Abhinandan Dubey 5 years, 4 months ago

there! Have questions about your homework? At Brainly, there are 150 million students who want to help each other learn. Questions are usually answered in less than 10 minutes. Try it for yourself by posting a question! :D JOIN US!

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Abhinandan Dubey 5 years, 4 months ago

Let, the cost of pen be Rs x and Cost of notebook is twice the cost of pen=Rs 2x It's given that cost of notebook = 2× cost of pen Therefore, x=2x x-2x=0 x-2x=0 is the linear equation in two variables.Let, the cost of pen be Rs x and Cost of notebook is twice the cost of pen=Rs 2x It's given that cost of notebook = 2× cost of pen Therefore, x=2x x-2x=0 x-2x=0 is the linear equation in two variables.

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Aarushi Erande 5 years, 4 months ago

•Let the cost of the notebook be x and the cost of the pen be y •Now, the equation would be x = 2y. now putting any value for x or y we will get the coordinates. • Now you can draw the graph with this equation.

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Samruddhi Khonde 5 years, 4 months ago

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ANSWER

Rationalise the denominator of * Option 1 Option 2 Option 3

Posted by Vivek Vallyapur 5 years, 4 months ago

CBSE > Class 09 > Mathematics

1 answers

Vivek Vallyapur 5 years, 4 months ago

Rationalise the denominator of * Option 1 Option 2 Option 3

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ANSWER

Factorise- 3x-4^2

Posted by Ananya Sharma 5 years, 4 months ago

CBSE > Class 09 > Mathematics

1 answers

Ananya Sharma 5 years, 4 months ago

12345

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ANSWER

One eqilateral triangle of side 2cm. What is the area of this triangle by herons formula?

Posted by Shravani Walke 5 years, 4 months ago

CBSE > Class 09 > Mathematics

2 answers

Arpit Agnihotri 5 years, 4 months ago

Sides of equilateral triangle =2cm,2cm,2cm If a=2cm , b= 2cm and c=2 cm Then, s(semi perimeter)=(2+2+2)/2 =6/2 =3cm =s Now by, heron's Formula area of a triangle=√s(s-a)(s-b)(s-c) =√3(3-2)(3-2)(3-2) =√3(1)(1)(1) =√3 cm² Therefore area of equilateral triangle with sides 2cm each is √3cm².

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Gaurav Seth 5 years, 4 months ago

A n s w e r:

By Herons formula,

Area of equilateral triangle=√3a²/4

Given,

a= 2cm

Therefore,

Area of the triangle

= (√3a²/4) cm²

= (√3 × 2²/4) cm²

= (4√3 /4) cm²

= √3 cm²

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ANSWER

Find the area of an equilateral triangle having altitude h cm. 9th

Posted by Himanshi Arora 5 years, 4 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

Two Americans are going one is father of the son of the Other what is the relationship between the two....?? A. Father-son B. Mother-son C. Mother-daughter D. Husband-wife E. None of these

Posted by Rani ? 5 years, 4 months ago

CBSE > Class 09 > Mathematics

4 answers

Samruddhi Khonde 5 years, 4 months ago

D. Husband-Wife

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Arpit Agnihotri 5 years, 4 months ago

D Husband-wife

2Thank You

Kiran Choudhary 5 years, 4 months ago

D. Husband wife.

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Apoorva Srivastava 5 years, 4 months ago

D. Husband-Wife

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ANSWER

z + 1/z) = 6, find the value of (z - 1/z

Posted by Rakibul Shaikh 5 years, 4 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

Factorise x 3- 3 x 2- 9 x -5

Posted by Anjali Pathania 5 years, 4 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

,sddd

Posted by Shivam Sk 5 years, 4 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

How to draw 135°

Posted by Krishna Chouhan 5 years, 4 months ago

CBSE > Class 09 > Mathematics

2 answers

M U 5 years, 4 months ago

To construct 135 degree angle we first construct 90 degree angle and its steps of constructions are as follows: 1). Use ruler and draw a Line segment OB of any convenient length. (as shown below) 2). Now use compass and open it to any convenient radius. And with O as center , draw an arc which cuts line segment OB at X . (as shown below) 3). Again use compass and opened to the same radius (as of step 2). And with X as center , draw an arc which cuts first arc at D . (as shown below) 4). Again use compass and opened to the same radius (as of step 2). And with D as center , draw another arc which cuts first arc at C . (as shown below) 5). Again use compass and opened to the same radius (as of step 2). And With C & D as center, draw two arc which cuts each other atE . (as shown below) 6). Join OE and extent it to A. (as shown below) 7). Above formed angle AOB = 90 Degree . 8) . Extend BO to Z . (as shown below) 9). Since ZB is a straight line, so formed Angle AOZ = 90 Degree (angle sum property) Now, to construct at 135 degree angle, we will construct the angle bisector of above angle AOB. And its done in the following steps: 10). Again use compass and open it to any convenient radius. And with O as center , draw an arc which cuts line segment OB at P and OA at Q . (as shown below) 11). Again use compass and opened to same radius (as of step 10).And with P & Q as center and, draw two arcs which cuts each other at point F. (as shown below) 12). Join OF and extend to E . (as shown below) 13). EO is the bisector of Angle AOB. Therefore, Angle AOE = Angle EOB = ½ of Angle AOB = 45 Degree each (as shown below) 14). Now observe that: Angle ZOA = 90° Angle AOE = 45° Add both the angles and we get Angle ZOA + Angle AOE = 90° + 45° ..... (Statement 1) Now observe the above diagram: Angle ZOA + Angle AOE = Angle ZOE ..... (Statement 2) From Statement 1 and 2, we get: Angle ZOE = 135° (as highlighted with pink color)

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Gaurav Seth 5 years, 4 months ago

The steps of constructions are: