Tuesday

October 21, 2014

October 21, 2014

Posted by **Mackenzie** on Wednesday, January 14, 2009 at 10:37pm.

- algebra -
**Reiny**, Wednesday, January 14, 2009 at 10:48pmVol =pi(r^2)(2r) = 54pi

so 2r^3pi = 54pi

r^3 = 27

r = 3

the surface area is made up of 2 circles plus a rectangle with height 2r and length 2pir

rectangle = 2pi(r)(2r) = 4pi(r^2)

the 2 cirlces have area of 2pi(r^2)

so the total area = 6p(r^2)

= 6pi(9) = 54pi cm^2

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