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Question

Find the perimeter of a semicircle whose diameter is 14 cm.

A
21 cm
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B
22 cm
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C
36 cm
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D
44 cm
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Solution

The correct option is C 36 cm

radius = r = diameter2 = 142 = 7 cm
Perimeter of semicircle
= length of arc APB(semicircular) + AB
= half of circumference + diameter
= 12×(2πr) + d
= πr + d
= 227×7 + 14
= 22 + 14 = 36 cm

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