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The area of a circle is about 167.3306 square inches. The circle's circumference is ____ inches.Use 3.14 for π.

1 Answer

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The area of a circle can be calculated using this formula:


A=\pi r^2

Where "r" is the radius of the circle.

The circumference of a circle can be found using this formula:


C=2\pi r

Where "r" is the radius of the circle.

In this case you know that the area of this circle is:


A\approx167.3306in^2

Then, you can substitute this value into the first formula and solve for "r". Use:


\pi=3.14

Then:


\begin{gathered} (167.3306in^2)=(3.14)r^2 \\ \\ ((167.3306in^2))/(3.14)=r^2 \\ \\ r=\sqrt[]{((167.3306in^2)/(3.14))} \\ \\ r=7.3in \end{gathered}

Now you can substitute this value into the formula for calculate the circumference of a circle:


\begin{gathered} C=(2)(3.14)(7.3in) \\ \end{gathered}

Finally, evaluating, you get:


C=45.844in

The answer is:


45.844in

User Michael Moulsdale
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