Answer : 4 38.57 cm Explanation : Answer: D) 38.57 cm Explanation: We know that perimeter of rectangle = 2(l b) = 2(8 7)= 30cmGiven perimeter of square is twice the perimeter of rectangle = 2(30) = 60cmTherefore, side of the square is = 1/4 x 60 = 15cmCircumference of the required semicircle = πr 2r = 227× 152 2×152 = 23.57 15 = 38.57cm.

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