Question

# Find the circumference of a circle whose radius is $3\text{ m}$. Round off your answer to the nearest tenth, if necessary. Use $3.14$ or $\frac{22}{7}$ for $\pi$.

Solution

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The circumference (C) of a circle is $2\pi$ times the radius $r$:

$C=2r\pi$

Substitute radius of this circle.

$C\approx2\cdot3\cdot3.14\approx18.84\approx18.8$

The circumference of the circle is about $18.8$ m.