Answer
$r=5.35ft$
Work Step by Step
We use the formula for the area of a circle $A=\pi*r^{2}$ and solve for $r$ to find the radius.
We have the area:
$A=90ft^{2}$
thus:
$A=\pi*r^{2}$
$r=\sqrt {\frac{A}{\pi}}=\sqrt {\frac{90ft^{2}}{\pi}}=5.35ft$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 12 - Section 12.5 - Circles - Exercise - Page 410: 18
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