In Fig.15.72(a), OABC is a square of side 7cm. If OAPC is a quadrant of a circle with centre O, then find the area of the shaded region.
Given,
Side of square = 7cm
Area of square = (side)2 = 72 = 49cm2
Area of quadrant OAPC = 
Area of shaded region = (area of square – area of quadrant)
= 49 – 38.5 = 10.5 cm2
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