the area of a semicircle is 157 square cm.Its diameter is
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area of semicircle =157
area of semicircle = πr^2
157 = 22/7×r^2
r^2 = 157×7/22
r^2 = 49.9545
r = √49.9545
r = 7 cm
diameter =2r
diameter =2×7
diameter = 14 cm
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