Answer
5 km
Work Step by Step
$A = \pi*r^2$
$A = 25\pi$
$25\pi=\pi*r^2$
$25\pi/\pi=\pi*r^2\pi$
$25=r^2$
$\sqrt {25} = \sqrt {r^2}$
$r = 5$ ($r\ne-5$ since we cannot have a negative radius length)
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 6 - Section 6.7 - Quadratic Equations and Problem Solving - Exercise Set - Page 465: 12
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