Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 10 - Radical Expressions and Equations - Cumulative Test Prep - Multiple Choice - Page 647: 12



Work Step by Step

$A=\pi*r^2$ $A/\pi=\pi*r^2/\pi$ $A/\pi=r^2$ $\sqrt{A/\pi}=\sqrt{r^2}$ $\sqrt {A/\pi} = r$ $r=\frac{\sqrt {A\pi}}{\pi}$ $r*\pi=\pi*\frac{\sqrt {A\pi}}{\pi}$ $\pi*r = \sqrt {A\pi}$ $(\pi*r)^2 = (\sqrt {A\pi})^2$ $\pi^2*r^2 = A\pi$ $\pi^2*r^2/\pi = A\pi/\pi$ $\pi*r^2=A$
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