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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Updated on: 10-Oct-2022

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