Question

Two similar cylinders have heights 12 inches and 18 inches.

What is the ratio of their surface areas?

8 : 27

2 : 3

4 : 27

4 : 9

Answer 1

Do you know the formula for surface area?

Answer 2

no

Answer 3

Surface area(A)=2πrh+2πr2

Answer 4

r=radius
h=height

Now plug in value and take the ratio.

Answer 5

i dont know the radius

Answer 6

You could assume them to be same as it is mentioned similar cylinders. Only their heights are different. That is what I can make out from the given info.

Answer 7

i used 4

402.12 and 552.92

Answer 8

For similar figures, if the lengths change by a factor of m, the areas change by m^2, and the volumes by m^3.

Answer 9

@AravindG

Answer 10

how do you get the answer from that

Answer 11

Take the ratio!