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April 18, 2015

April 18, 2015

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

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 11:58amI 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 12:19pmSo then the answer is it suppose to be 1:27 or 1:9?

Thanks.

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