Question

Find the circumference of a circle whose radius is 3 m3\text{ m}. Round off your answer to the nearest tenth, if necessary. Use 3.143.14 or 227\frac{22}{7} for π\pi.

Solution

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The circumference (C) of a circle is 2π2\pi times the radius rr:

C=2rπC=2r\pi

Substitute radius of this circle.

C233.1418.8418.8C\approx2\cdot3\cdot3.14\approx18.84\approx18.8

The circumference of the circle is about 18.818.8 m.

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