Answer
$A=\pi r^2,$ where $r$ is the radius of the circle and $A$ is the area
Work Step by Step
Let the area is $=A$
and radius is $r$.
Area $=$product of $\pi$ and square of the radius.
The mathematical equation is
$A=\pi r^2$.
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.8 Problem Solving: Interest, Mixture, Uniform Motion, Constant Rate Job Applications - A.8 Assess Your Understanding - Page A69: 9
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