Doug C. answered 08/23/17
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What fraction of the area of the square is the area of the circle?
Let r = radius of the circle. Then the side of the square is 2r.
Area of square = (2r)(2r) = 4r2.
Area of circle is πr2.
So the answer to the first question is πr2/4r2 = π/4. Find the decimal equivalent and convert to a percentage.