PQRS is a diameter of a circle of radius 10.5 cm, the lengths PQ, QR and RS are equal. Semicircles are drawn as shown in figure. Find the area of the shaded region.
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PQRS is a diameter of a circle of radius 6
The lengths PQ, QR and RS are equal. Semi circles are drawn on PQ and QS as diameters. Find the perimeter and area of the region so obtained.
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