Answer
$C=2\pi r$
Work Step by Step
Circumference $C$ of a circle whose radius is $r$ units is $C=2\pi r$.
Hence, the correct fill in the blanks is $C=2\pi r$.
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Appendix A - Review - A.2 Geometry Essentials - A.2 Assess Your Understanding - Page A19: 3
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