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.

Answer 1

Surface Area = (pi * r^2) + (pi * r * h)

3.14 * 9 = 28.26 sq. in
3.14 * 4 * 9 = 113.04 sq. in.

113.04 + 28.26 = 141.3 total sq. in.

40/5 = 8 sq. in. per minute

Divide the total square inches by 8 to find the time.

Answer 2

The answer in the book is 25 minutes but with your figures I came up with 17.66 rounded to 18 minutes?