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What is the radius of a circle with circumferenceC= 40 CM

What is the radius of a circle with circumferenceC= 40 CM-example-1

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Solution:

The circumference C, of a circle is;


C=\pi r^2

Given;


C=40cm,\pi=3.14

The radius r, is;


\begin{gathered} 40=3.14(r^2) \\ \text{Divide both sides by 3.14} \\ (40)/(3.14)=(3.14(r^2))/(3.14) \\ r^2=12.74 \\ \text{Take the square root of both sides;} \\ \sqrt[]{r^2}=\sqrt[]{12.74} \\ r=3.57 \end{gathered}

The radius of the circle is 3.57cm

User MH Fuad
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