3) The City of Oz has to repaint its cylinder-shaped water tower. Only the top and sides need to be painted. If the water tower has a height of 60 feet and a radius of 20 feet, how many square feet must be painted? A) 400π ft2 Eliminate B) 2400π ft2 C) 2800π ft2 D) 4400π ft2

Question

Mathematics

Aspen Edwards

24 January, 00:19

3) The City of Oz has to repaint its cylinder-shaped water tower. Only the top and sides need to be painted. If the water tower has a height of 60 feet and a radius of 20 feet, how many square feet must be painted? A) 400π ft2 Eliminate B) 2400π ft2 C) 2800π ft2 D) 4400π ft2

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Answers (1)

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Zaid Cantu · Answer 1

The formula for SA of a cylinder is 2 pi r^2 + 2 pi r h

The 2 pi r^2 is for the circular top and bottom. In this case only the TOP is being painted so the 2 can be dropped.

SA = pi r^2 + 2 pi h

SA = pi 20^2 + 2 pi 20*60

SA = 400 pi + 2400 pi

SA = 2800pi ft^2

C