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A square ABCD is inscribed in a circle o...

A square ABCD is inscribed in a circle of unit radius. Semicircles are described on each side as a diameter. The area of the region bounded by the four semicircles and the circle is (1) 1 sq. unit (2) 2 sq. unit (3) 1.5 sq. unit(4) 2.5 sq. unit

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