Homework Help: Geometry

Posted by mary on Monday, April 18, 2011 at 9:42am.

A cylindrical flower pot with an open top needs to be painted. The height of the pot is 9 inches and the 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 20 minutes

Geometry - MathMate, Monday, April 18, 2011 at 11:21am
Area of the curved surface ("outside") is
A = 2πrh
where r=3", h=9".
Check your arithmetic, I came up with a little more than 20 minutes.

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