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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...Asked by Mary
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.
Answers
Answered by
Ms. Sue
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.
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.
Answered by
Mary
The answer in the book is 25 minutes but with your figures I came up with 17.66 rounded to 18 minutes?
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