A square, with perimeter 40, is inscribed in a circle. What is the area of the circle? Pick one:	A) 50π	B) 40π	C) 30π	D) 25π	E) 35π
50πrea of circuscribed circle = pi/2*area of square   50πrea of square = (40/4)^2 = 10^2= 100   50πrea of circle = pi/2*100=50pi   50πnswer : 50π
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A square, with perimeter 40, is inscribed in a circle. What is the area of the circle?