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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 B) 2400π ft2 Eliminate C) 2800π ft2 D) 4400π ft2

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Among the choices provided the answer should be letter C. Below is the solution:

top 
pi r^2 or pi 400 
sides 
2 pi r 60 
40 60 pi 
2400pi 

so add the top and side we get p400 + p*2400 = 2800 pi ft^2

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