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On exercise 9.3 i dont understand question one

Posted by Reem Loaz 5 years, 1 month ago

1 answers

Aditya Sinha 5 years, 1 month ago

Since ad is the median you can use that to prove triangles abd and adc equal in area then take ed as median in triangle edc to prove ar ebd and ar edc equal now subtract this from equation 1 to get ar abe =ar aec

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A plastic box 1.5m long, 1.25m wide and 65 cm deep is to be made . It is opened at the top. Ignoring the thickness of the plastic sheet, determine: The area of the sheet required for making the box The cost of sheet for it, if a sheet measuring 1m cost 20

Posted by Mohd Rehan 5 years, 1 month ago

CBSE > Class 09 > Mathematics

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Eaual chord of congurent circles are equidistant from the centres

Posted by Shalini Mishra 5 years, 1 month ago

CBSE > Class 09 > Mathematics

0 answers

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x-a)

Posted by Gaurav Budhwar 5 years, 1 month ago

CBSE > Class 09 > Mathematics

0 answers

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Exercise 13.4 Q7

Posted by Daksh Goyal 5 years, 1 month ago

CBSE > Class 09 > Mathematics

1 answers

Ropal Singh Raghav 5 years, 1 month ago

Let the radius of the earth=r Radius of the moon=r/4 Surface area of a sphere=4Πr2 Since,the earth as well as moon are considered to be sphere. Surface area of earth=4Πr2 Surface area of moon=4Π(r/4)2 Surface area of earth /Surface area of moon=4Πr2/4Π(r/4)2=r2/(r/4)2=16r2/r2=16/1=16:1

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Chapter 1 questions 1

Posted by Jyoti Pal 5 years, 1 month ago

CBSE > Class 09 > Mathematics

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X and Y are points on the side LN of triangle LMN such that LX =XY=YN.through X aline is drawn parallel LM to meet MN at Z .prove that ar triangle LZY=ar MXYZ

Posted by Tushar Kumar 5 years, 1 month ago

CBSE > Class 09 > Mathematics

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what is the value of G

Posted by Divyanshu Singh 5 years, 1 month ago

CBSE > Class 09 > Mathematics

2 answers

Aditya Sinha 5 years, 1 month ago

The answer is 6.67 ×10^ minus 11 nm / kg ^2

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Prabhjot Kaur 5 years, 1 month ago

6.673 Nm^2 Kg^2

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The point whose ordinate is -3 and which lies on y-axis is

Posted by Ropal Singh Raghav 5 years, 1 month ago

CBSE > Class 09 > Mathematics

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Vansh Kukreja 5 years, 1 month ago

(0,3)

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Prabhjot Kaur 5 years, 1 month ago

Abssica 0

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A rational number between √2 and√3 is:

Posted by Ropal Singh Raghav 5 years, 1 month ago

CBSE > Class 09 > Mathematics

1 answers

Vansh Kukreja 5 years, 1 month ago

3/2 or 1.5

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Write 3x=5 as in an equation in two variables

Posted by Devansh Shah 5 years, 1 month ago

CBSE > Class 09 > Mathematics

3 answers

Vansh Kukreja 5 years, 1 month ago

3x +0y-5=0

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Harsh Parashar 5 years, 1 month ago

3x-5=0(y)

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Ritu Kaushal 5 years, 1 month ago

3x-5=0

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Chapter2

Posted by Ghanshyam Sharma 5 years, 1 month ago

CBSE > Class 09 > Mathematics

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whole cube of a+b

Posted by Divyansh Sisodiya 5 years, 1 month ago

CBSE > Class 09 > Mathematics

4 answers

Aditya Sinha 5 years, 1 month ago

A cube + b cube + 3a square b + 3 a b square Please give thanks

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Devansh Shah 5 years, 1 month ago

How to solve equation in two variables

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Anjana Mishra 5 years, 1 month ago

(A+B)^3

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Ojasvi Kaushik 5 years, 1 month ago

a cube+b cube+3ab(a+b)

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What is the formula S =

Posted by Ashish Agrahari 5 years, 1 month ago

CBSE > Class 09 > Mathematics

6 answers

Nikhil B 5 years, 1 month ago

a+b+c/2

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Ruchi Bansal 5 years, 1 month ago

S= a+b+c/2

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Vansh Kukreja 5 years, 1 month ago

a+b+c/2

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Nitin Singh 5 years, 1 month ago

S=a+b+c/2

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Dr. Sanjay Mohan Jha 5 years, 1 month ago

________________ S(s-a)(s-b)(s-c)

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Harsh Raj 5 years, 1 month ago

S=sum of all sides/2

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Two equal circles intersect in P and Q.A straight line through P meets the circle in A and B. Prove that QA=QB.

Posted by Divyansh Dubey 5 years, 1 month ago

CBSE > Class 09 > Mathematics

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A plastic box 1.25m wide and 7m

Posted by Bhole Shankar 5 years, 1 month ago

CBSE > Class 09 > Mathematics

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A solid cube has been cut into two cuboids of equal volumes. Find the ratio of TSA of one of the cuboids to that to the given cube.?

Posted by Gopesh Kawatra 5 years, 1 month ago

CBSE > Class 09 > Mathematics

2 answers

Abhinav Soni 5 years, 1 month ago

When this cube is cutted into two cuboids then, [As we know volume of cuboid is -> 2*(l*b+b*h+h*l)] Let one of those cuboid be x and another be y . Now, for the ratio of their TSA=> = volume of x cuboid/volume of y cuboid = 2*(l*b+b*h+h*l)/2*(l*b+b*h+h*l) Therefore now when we cancel out each of them so the results will be, = 1/1 = 1: 1

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Yogita Ingle 5 years, 1 month ago

The surface area of a cub is 6*(area of one face) = 6LW
The volume of a cube is LWH
acube = 6LW

to make two equal cuboids, we cut the cube in half through its height - LW(.5H)
The surface area of the cuboid is
base + top + four sides
LW + LW + 4(.5HL)
2LW + 2LH
acuboid = 2L(W+H)

so the ratio of the cube to the cuboid is
acube : acuboid
6LW : 2L(W+H)
now, the important part, since we started with a cube L = W = H, so we can simplify
6LL : 2L(L+L)
6L² : 2L(2L)
6L²: 4 L²
6:4
3:2

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A chord of a circle is equal to the radius of the circle find the angle subented by the chord at a point on the miner arc and also at a point on the major arc

Posted by Ashish Agrahari 5 years, 1 month ago

CBSE > Class 09 > Mathematics

2 answers

Srijan Suman 5 years, 1 month ago

For more reference please ask you teacher and clarify your doubts if any.

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Srijan Suman 5 years, 1 month ago

It is theorem 10.8 of chapter circles on page no. 180-181 The proof will be same for the three cases

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Prove that 9³/²-3×2°-(1/81)-½=15

Posted by Varsha Varsha 5 years, 1 month ago

CBSE > Class 09 > Mathematics

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Give the geometric representation of 2x +9 =0 as an equation In one variable In two variable

Posted by Aditya Sinha 5 years, 1 month ago

CBSE > Class 09 > Mathematics

1 answers

Yogita Ingle 5 years, 1 month ago

Give the geometric representation of 2x +9=0 as an equation (i) in one variable (ii) in two variable

2x + 9 = 0

=> x = -4.5

2x + 9 = y

x y

-5 -1

-4 1

-3 3

-2 5

-1 7

0 9

1 11

2 13

Draw graph of given points

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If the figure ,if ab||cd then measure of p is

Posted by Aryan Pandey 5 years, 1 month ago

CBSE > Class 09 > Mathematics

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under route7/7

Posted by Suresh Kumar 5 years, 1 month ago

CBSE > Class 09 > Mathematics

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a right angle triangle whose sides is 3cm and 4cm revolves towards its hypotenuse. then find the volume of the double cone?

Posted by Aditya Verma 5 years, 1 month ago

CBSE > Class 09 > Mathematics

1 answers

Yogita Ingle 5 years, 1 month ago

Given that in a right angled triangle, whose sides are 3 cm and 4 cm(other than hypotenuse).
The double cone so formed by revolving this right-angled triangle ABC about its hypotenuse .
Hypotenuse AC = Ö( 32 + 42) = 5 cm
Area of ΔABC = (1/2) x AB xAC
⇒ (1/2) x AC x OB = (1/2)x 4 x3
⇒ (1/2) x 5 x OB = 6
⇒ OB = 12 / 5 = 2.4 cm.
Volume of double cone = Volume of cone 1 + Volume of cone 2
= (1/3) πr²h₁+ (1/3)πr²h₂
= (1/3) πr²(h₁ + h₂)
= (1/3) πr²(OA +OC)
= (1/3) x 3.14x(2.4)² x(5)
= 30.14 cm³