What is the approximate perimeter of a semicircle with a diameter of 18 inches?

asked Jul 14, 2023 6.9k views

3 votes

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4 votes

Given:

Diameter =18

$\begin{gathered} \text{radius}=(D)/(2) \\ =(18)/(2) \\ =9 \end{gathered}$

Perimeter of semicircle is:

$=\pi r+2r$

So the perimeter is:

$\begin{gathered} =\pi(9)+2(9) \\ =9\pi+18 \\ =28.2743+18 \\ =46.2743 \end{gathered}$

Jerome Dochez answered Jul 18, 2023

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