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April 1, 2015

April 1, 2015

Posted by **JOY** on Tuesday, May 24, 2011 at 9:33am.

I came up with 141.3 total sq inches

answer should be 25 minutes but I don't get that??

- Geometry -need help -
**Jai**, Tuesday, May 24, 2011 at 9:56amrecall that the surface area of cylinder is given by

SA = 2πr^2 + 2πrh

where

r = radius

h = height

π = "pi" equal to 3.14 (constant)

substituting,

SA = 2*(3.14)*3^2 + 2*(3.14)*3*9

SA = 226.08 in^2

then we divide this by his speed, 40 in^2/5 min:

226.08/(40/5)

226.08 / 8 = 28.26 minutes

hope this helps~ :)

and multiply this by 5

- Geometry -need help -
**JOY**, Tuesday, May 24, 2011 at 10:12amthank you

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