Posted by **B.B.** on Sunday, September 6, 2009 at 11:37am.

What is the ratio of the surface area for a pair of similar cylinders when the ratio of the heights is 1:3?

A) 1:4 B) 1:27 C) 1:9 D) 1:1

My answer is C) 1:9. Is this correct? Thanks.

- Math -
**bobpursley**, Sunday, September 6, 2009 at 11:58am
I am not certain what you mean by similar?

Same diameter, different heights?

Same ratio changing height and diameter?

Are you considering surface area to include the ends?

If the same ratio is changing height and diameter is 1:3, then

SA=2PIr^2 + 2PIr(h) and if r and h are increased by three, then SA changes by a factor of nine.

- Math -
**B.B.**, Sunday, September 6, 2009 at 12:19pm
So then the answer is it suppose to be 1:27 or 1:9?

Thanks.

## Answer This Question

## Related Questions

- MATH 157 - what is the ratio of the surface areas for a pair of similar ...
- Math - What is the ratio of the surface area for a pair of cylinders when the ...
- geometry-finding ratio - Ratio of the heights of two similar cones is 7/9 what ...
- geometry - Two triangles are similar, and the ratio of each pair of ...
- Geometry - If the length of the sides of two similar triangles are in the ratio...
- math - In a pair of similar rectangles, the ratio of the widths Is 3:4. What is ...
- Math - Two triangles are similar, and the ratio of each pair of corresponding ...
- Biology - When cells increase in size, the surface area to volume ratio ...
- math - Two prisms are similar. The surface area of one is four times the surface...
- Geometry - Find the ratio for the similar figure. If the area ratio is 4:49, ...

More Related Questions