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March 29, 2017

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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 - ,

    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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