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If the diameter of a semicircular protractor is $14\ cm$, then find its perimeter.
Given: Diameter of a semicircular protractor is $14\ cm$.
To do: To find its perimeter.
Solution:
As given, diameter of the protaactor$d=14\ cm$
$\Rightarrow$ Radius$=\frac{14}{2}=7\ cm$
Then, Perimeter of semicircle$=\pi\times r+2\times r$
$=\frac{22}{7}\times7+2\times7$
$=22+14$
$=36\ cm$
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