Answer :

Consider midpoint side AB, it forms Smaller square of size 5cm


For this smaller square


Area of shaded region


= Area of 1st quadrant + area of 2nd quadrant –area of square


Area of both quadrants is same


Area of shaded region


= 2 × Area of quadrant - area of square


= 2 × – r × r


= 2 × – 5 × 5


= 2 × – 5 × 5


= 14.25 cm2


Area of total shaded region = 4 × 14.25


= 57 cm2


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