Diameter of semicircular protractor is $7 c m$ . Find Its perimeter is :

24 c m

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18 c m

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36 c m

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22 c m

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Solution

The correct option is B $18 c m$
$2 r = 7 \Rightarrow r = \frac{7}{2} c m$
$A B + A B = (\frac{22}{7} \times \frac{7}{2} + 7) c m$
$= 18 c m$

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