AB is the diameter of semi circle.BC 8 cm.What is the perimeter of ABC
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Circumference of semi-circle =d+
2
πd
Length of boundary of shaded portion =8+
2
π(8)
+4+
2
π(4)
+2+
2
π(2)
=14+7π
=14+7×
7
22
=36 cm
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