SOLUTION: what is the area of a semicircle with diameter 20 ft?

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Question 283641: what is the area of a semicircle with diameter 20 ft?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
radius =10
circle area=pi*r^2
semi=1/2*pi*r^2
S=1/2*3.14*100
s=1/2*314
s=157 ft^2