Question

Two similar cylinders have heights 6 inches and 15 inches.

What is the ratio of their surface areas?
8 : 25

9 : 10

4 : 25

9 : 25

Answer 1

What is the formula for a cylinder?

Answer 2

Erm, the formula for the Surface area of a cylinder?

Answer 3

pi*r2*h?

Answer 4

you know that r is the same, so you don't need to consider it, put the other values into an equation.

Answer 5

Although use the actual formula \[Area = 2 \pi r(r+h)\]

Answer 6

so 2*3.14(6+15)

Answer 7

that's one, now do the other one and you will have the ratio.

Answer 8

what other one?

Answer 9

The formula's are
2*3.14(15)
2*3.14(6)
You forgot to remove the second radius

Answer 10

so the first answer is 94.2 and the second one is 37.68