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A circular mirror has a radius of 40 inches. Find the circumference to the nearest tenth of an inch.

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To calculate the circumference, you can use the formula:


C=2\pi r

Where C is the circumference and r is the radius.

Then, you can follow the steps.

1. Substitute the radius in the equation.

In this exercise, r = 40 inches.


\begin{gathered} C=2\pi40 \\ C=80\pi \end{gathered}

2. To get the approximate result, use π= 3.14 and multiplicate it in the equation.


\begin{gathered} C=80\cdot3.14 \\ C=251.2in^2 \end{gathered}

Done! You found the circumference.

Answer: 251.2 in².

User Joshua Barker
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