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Question

In a fig a semi circle is drawn with O as centre and AB as diameter. Semi circle are drawn with AO and BO as diameter if AB=28cm find the perimeter of shaded range.

A
98cm
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B
48cm
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C
80cm
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D
88cm
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Solution

The correct option is D 88cm
Perimeter of the shaded region=Perimeter of bigger semi-circle+2(Perimeter of smaller semi-circle)
=πD+2(πd)
=227×14+2(227×7)
=44+2×22
=44+44
=88cm

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