Homework Help: Geometry -need help

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

A cylinder flower pot with open top needs to be painted. The height is 9 inches and radius is 3 inches. If it takes Troy 5 minutes to paint 40 square inches, how long to the minute will it take him to paint the outside of the flower pot.
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 9:56am
recall 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 10:12am
thank you

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