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Area of Circle

A wire is in ...

Question

A wire is in the form of semi-circle of $7 c m$ radius. The length of the wire will be

A

22 c m

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B

36 c m

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C

5 c m

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D

39 c m

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Solution

The correct option is B $36 c m$
Radius of the semicircle $= 7$ cm ( $r = 7$ cm)

Length of the wire $=$ perimeter of the semicircle $+$ diameter $= π r + 2 r$

$= \frac{22}{7} \times 7 + 2 \times 7$

$= 22 + 14 = 36$ cm.

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