Question 883622
A silo has a outside 
dimension of 12ft in diameter and is 30ft high. What is the square foot 
area of outside wall.
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Lateral area = {{{2pi*r*h = 2*pi*6*30 = 360pi}}} sq ft
=~ 1131 sq ft
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The top is pi*r^2 = 36pi sq ft
=~ 113 sq ft