Answer
$C=2 \pi r$.
Work Step by Step
The formula for the circumference $C$ of a circle of radius $r$ is $C=2 \pi r$. In words, the circumference is "2 pi times the radius".
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Appendix A - Review - A.2 Geometry Essentials - A.2 Assess Your Understanding - Page A19: 3
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