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Review: Circular Garden and Circular Statue
Explanation
The area to be covered with gravel is the area within the
garden and not covered by the statue, so it will be the difference of these two
areas. The radius of the statue is half the diameter, so it's 1. The radius of
the large circle is 20 plus the radius of the statue, since the statue is in
the center of the garden, so it's 21. Using 
for the area of a circle, the small area is 
and the larger area is 
.
The difference is 
.
The correct answer is (E).
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