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

Let the four angles of the quadrilateral be 3x, 5x, 9x and 13x. 3x+5x+9x+13x=360° [sum of all angles of the quadrilateral is 360°] 30x=360° x=12° Hence, the angles of the quadrilateral are 3×12°=36° ,5×12°=60° ,9×12°=108° and 13×12°=156°

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Kapil Lalwani 3 years, 7 months ago

Let the four angles of the quadrilateral be 3x, 5x, 9x and 13x 3x+5x+9x+13x=360 ∘ [sum of all angles of the quadrilateral is 360 ∘ ] 30x=360 ∘ x=12 ∘ Hence, the angles of the quadrilateral are 3×12 ∘ =36 ∘ ,5×12 ∘ =60 ∘ ,9×12 ∘ =108 ∘ and13×12 ∘ =156 ∘

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Shazia Sk 3 years, 7 months ago

3x+5x+9x+13x=360° 30x=360° x=360÷30= 12 Now, to find the angles, let's put the value of x 3x= 3×12= 36 5x= 5×12= 60 9x= 9×12= 108 13x= 13×12= 156 Hence, the 4 required angles of the quadrilateral are: 36, 60, 108 and 156 Hope this helps you.

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Naitik Sati 3 years, 7 months ago

Let the angle of quadrilateral be x Therefore, angle A=3x, angle B=5x, angle C=9x, angle D=13x angle A +angle B +angle C +angle D=360° Therefore, 3x + 5x + 9x +13x= 360° 30x=360° x=360/30 x=12 Therefore ,angle, A =36, B=60, C =108, D=156

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Derivation of cone formulas

Posted by .. ... 3 years, 7 months ago

CBSE > Class 09 > Mathematics

1 answers

Himanshu Raj 3 years, 7 months ago

The capacity of a cone is one-third of the capacity of the cylinder. That means if we take 1/3rd of the volume of the cylinder, we get the formula for cone volume. Volume of a cone = (1/3) πr2h cubic unit

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Define centroid of a triangle

Posted by Anushka Chaudhary 3 years, 7 months ago

CBSE > Class 09 > Mathematics

3 answers

Rishabh Sharma 3 years, 7 months ago

The centroid of a triangle is the point where all the medians of a triangle meet. The centroid divides the medians in the ratio of 2 :1.

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Abhinav Sharma 3 years, 7 months ago

A centre where all median meet in the triangle

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Vidita Sen 3 years, 7 months ago

i want to say that where are you leaving

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The area of square is 7225 m2 . The length of one side of a field is

Posted by Mohd Nauman 3 years, 7 months ago

CBSE > Class 09 > Mathematics

4 answers

Himanshu Raj 3 years, 7 months ago

Let the side be x m.Then, Area of square=7225 m² => side × side =7225 => x × x =7225 => x² =7225 => x =√7225 => x =85 Therefore, length of one side of a field is 85 m✓✓

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Ranjeet Kumar Pandit?? 3 years, 7 months ago

85 m

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Vidita Sen 3 years, 7 months ago

86m he ok

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Dhirendra Pratap Singh 3 years, 7 months ago

85m

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Construct an angle of 90 degree at the initial point of a given ray and justify the construction

Posted by Aller Sonu 3 years, 7 months ago

CBSE > Class 09 > Mathematics

1 answers

Vidita Sen 3 years, 7 months ago

first draw a line 6m

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Prove that if two lines intersect each other then vertically opposite angle are equal

Posted by Manasavi P 3 years, 7 months ago

CBSE > Class 09 > Mathematics

1 answers

Keshav Kumar 3 years, 7 months ago

Jzj j SC i

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Prove that sum of interior angle of triangle are 180 degree.

Posted by Ronit Singh 3 years, 7 months ago

CBSE > Class 09 > Mathematics

1 answers

꧁༒♛ Cri.Ket♛༒꧂ . 3 years, 7 months ago

Check theorems of ch 6

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Expand (y-root3)^2

Posted by Anshika Pawar 3 years, 7 months ago

CBSE > Class 09 > Mathematics

3 answers

Himanshu Raj 3 years, 7 months ago

(y - √3)² = y² + 3 - 2y√3

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Ronit Singh 3 years, 7 months ago

Prove that sum of interior angle of triangle are 180 degree

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Amit Raj 3 years, 7 months ago

(y- √3)² =(a-b)² =(y)² +(√3)² -2*y*√3 =y² + 3 -2√3y Answer

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1800×2091

Posted by Rajeev Meena 3 years, 7 months ago

CBSE > Class 09 > Mathematics

1 answers

Neeraj Verma 3 years, 7 months ago

3763800

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What is a polynomial?

Posted by Priyanshu Singh 3 years, 7 months ago

CBSE > Class 09 > Mathematics

3 answers

Vijay Raut 3 years, 7 months ago

Many monomials comes together to form a polynomial

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Govind Sharma 3 years, 7 months ago

2pier

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Krishna Thakur 3 years, 7 months ago

Area of circle

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Read the passage given below and answer any four questions: Sohan's house has one bedroom hall with kitchen. His son needed a separate room for study. Thus Sohan planned to construct a new room with length 4m, width 2m and the height 3 m as shown in the following figure. The room was separate at the roof of the house. The dimensions of the bricks used are: 25 cm x 10 cm x 5 cm

Posted by Samarth Shinde 3 years, 7 months ago

CBSE > Class 09 > Mathematics

1 answers

Rajeev Meena 3 years, 7 months ago

Ttrry

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If two circles intersect at two points,prove that their centres lie on the perpendicular bisector of the common chord

Posted by Ridhwa A.M 3 years, 7 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

Exercise 2.3

Posted by Abhi Beniwal 3 years, 7 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

2y=0

Posted by Shilpa Yadav 3 years, 7 months ago

CBSE > Class 09 > Mathematics

3 answers

Ranjeet Kumar Pandit?? 3 years, 7 months ago

Given,2y=0 y=0/2 y=0 ans.

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Vijay Raut 3 years, 7 months ago

2y=0 Y=0/2 Y=0

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Ankit Raj 3 years, 7 months ago

Y=0/2

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What is formula Or cuboid

Posted by Shrishti Kumari 3 years, 7 months ago

CBSE > Class 09 > Mathematics

3 answers

Ranjeet Kumar Pandit?? 3 years, 7 months ago

Total surface area=2(lb+bh+hl) Curved surface area=2(l+b)h Volume= l×b×h

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Ankit Raj 3 years, 7 months ago

Volume=lbh TSA=2(lb+bh+lh) LSA=2(l+b)h. Or 2 (lh+bh) Diagonal =√l^2+b^2+h^2)

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Prachi Rajput 3 years, 7 months ago

2(lb+bh+hl)

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Find the volume of curved surface area and total surface area of cube with side 6 CM

Posted by Sakshi Upadhyay 3 years, 7 months ago

CBSE > Class 09 > Mathematics

3 answers

Bharti Rani 3 years, 7 months ago

Csa is 144 or tsa is 216

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Ranjeet Kumar Pandit?? 3 years, 7 months ago

CSA be 144 and TSA be 216

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Prince Chauhan?? 3 years, 7 months ago

The answer is 1

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What is 1×3000

Posted by Jagath Govind.B 3 years, 7 months ago

CBSE > Class 09 > Mathematics

5 answers

Amrta Arora 3 years, 7 months ago

3000

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Tyagi Ji 3 years, 7 months ago

3000

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Neha Tanwar 3 years, 7 months ago

3000

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Priya Ambani 3 years, 7 months ago

3000

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Jagath Govind.B 3 years, 7 months ago

3000

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The mean of 20 numbers is 20. If 5 is added to each of the first ten numbers, what will be new mean of the new set of 20 numbers?

Posted by Prince Bansal 3 years, 7 months ago

CBSE > Class 09 > Mathematics

5 answers

Ranjeet Kumar Pandit?? 3 years, 7 months ago

Given mean of 20 number =20.So,sum of total number=20×20=400 If we add 5 in first ten number then sum total of numbers be 450.then the new mean will be 450/20=22.5 ans.

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Hitesh Singh 3 years, 7 months ago

Mean of 20 number is given 20 from there we can find sum of observation by multiplying total number and mean ,we get 400 and then 5 is added 10times which is equal to 450 after that for finding new Mean : sum of all observations ÷Total number=450÷20=22.5

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Hitesh Singh 3 years, 7 months ago

New Mean 22.5

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Abhishek Pandey 3 years, 7 months ago

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Prince Bansal 3 years, 7 months ago

Please take me answer

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And iron pipe 20 cm long has exterior diameter equal to 25 CM if the thickness of the pipe is 1 centimetre find the whole surface area of pipe

Posted by Prashant Yadav 3 years, 7 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

Multiply 3√7 √5

Posted by Simmi Kumari 3 years, 7 months ago

CBSE > Class 09 > Mathematics

4 answers

Puneet Kour 3 years, 7 months ago

3√35

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Kapil Lalwani 3 years, 7 months ago

3√35

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Barnali Bhattacharjee 3 years, 7 months ago

3√35

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Prajakta Karmude 3 years, 7 months ago

3*1(√7*√5) =3√35

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How to find lateral surface area of cuboid , cube?..

Posted by Nisanth K 3 years, 7 months ago

CBSE > Class 09 > Mathematics

3 answers

Ranjeet Kumar Pandit?? 3 years, 7 months ago

Lateral surface area. 1.of cuboid=2(l+b)h 2.of cube=4(a)^2

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Asher Shibu 3 years, 7 months ago

L. S. A of a cuboid is 2h(l+b) L. S. A or cube is 4a^2(6a^2-2a^2

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Prajakta Karmude 3 years, 7 months ago

We can find the lateral surface area of cuboid by using the formula 2(l+b)*h And Cube - 4l^2

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Construct a right triangle ΔXYZ in which ∠? =900 , YZ=3cm, XZ+?? = 5??

Posted by God ♛ Shivansh 3 years, 7 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

Is √98/√2 a rational number and how

Posted by Simmi Kumari 3 years, 7 months ago

CBSE > Class 09 > Mathematics

2 answers

Ashish Singh 3 years, 7 months ago

√98=√(2*7*7) √98=√2*√7*√7 √98/√2=√2*√7*√7/√2 √2 will be cancelled So √98/√2=√7*√7 √[7*7] √49=7 Clearly, 7 is a rational number. Therefore √98/√2 a rational number.

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Prajakta Karmude 3 years, 7 months ago

√98/√2 is a rational number because when we simplify it we Get the Answer 7

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xraise to a

Posted by Anas Ansari 3 years, 7 months ago

CBSE > Class 09 > Mathematics

1 answers

Ankit Raj 3 years, 7 months ago

X to the power a X^a

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A tree breaks due to storm and the broken part bends so that the top of the tree touches the ground making an angle 30° with it. The distance between the foot of the tree to the point where the top touches the ground is 8 m. Find the height of the tree.

Posted by T.Dharshan [Tds] 3 years, 7 months ago

CBSE > Class 09 > Mathematics

1 answers

Priya Ambani 3 years, 7 months ago

Let the Height of the Tree =AB+AD and given that BD=8 m Now, when it breaks a part of it will remain perpendicular to the ground (AB) and remaining part (AD) will make an angle of 30 o Now, in △ABD cos30 o = AD BD ⇒BD= 2 3 AD ⇒AD= 3 2×8 also, in the same Triangle tan30 o = BD AB ⇒AB= 3 8 ∴ Height of tree =AB+AD=( 3 16 + 3 8 )m= 3 24 m=8 3 m

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If X=0 and y=k is a solution of the equation 5x-3y=3 find value of k

Posted by Jathin G V 3 years, 7 months ago

CBSE > Class 09 > Mathematics

4 answers

Ranjeet Kumar Pandit?? 3 years, 7 months ago

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Faiza Rafiq 3 years, 7 months ago

K=1

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Sumit Kumar 3 years, 7 months ago

5×0-3×k=3 -3×k=3 k=3+3 k=6

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Alankrita Singh. 3 years, 7 months ago

K= -1

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ANSWER

(2x+1) ³

Posted by Sübh@M Sahu 3 years, 7 months ago

CBSE > Class 09 > Mathematics

3 answers

Dhruv Jha 3 years, 7 months ago

a=2x , b = 1 => (a + b )³ = a³+ b³ + 3xy ( x+y ) => (2x+1)³= (2x)³+(1)³+3×2x×1(2x+1) =8x³+1+6x(2x+1) = 8x³+1+12x²+6x . So answer is (2x +1) is 8x^3 + 1+ 12x^2+ 6x

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Aafreen S 3 years, 7 months ago

=> a=2x , b = 1 => (a + b )³ = a³+ b³ + 3xy ( x+y ) => (2x+1)³= (2x)³+(1)³+3×2x×1(2x+1) =8x³+1+6x(2x+1) = 8x³+1+12x²+6x

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Mr Tech Genius 3 years, 7 months ago

8x^3+12x^2+6x+1

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ANSWER