Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 3 - 3.5 - Mathematical Modeling and Variation - 3.5 Exercises - Page 296: 54


$A=\pi r^2$

Work Step by Step

$A=kr^2$ $A=9\pi$ when $r=3$: $9\pi=k(3^2)=9k$ $k=\frac{9\pi}{9}=\pi$ Then: $A=\pi r^2$
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