Homework Help: Math 10

Posted by Caitlin on Monday, May 21, 2012 at 8:28pm.

A cylinder has a surface area of 250cm2. The height is twice as big as the radius. What is the height of the cylinder?

Math 10 - Reiny, Monday, May 21, 2012 at 8:44pm
h = 2r

SA = 2πr^2 + 2πrh
= 2πr^2 + 2πr(2r)
= 6πr^2

6πr^2 = 250
r^2 = 125/(3π)
r = 3.6418..
h = 2r = 7.28....

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