Answer
a = 12.123, 7.877
Work Step by Step
$A=\pi a(20-a)$ (Area A=300)
$300 = \pi a(20-a)$
$300/\pi = 20a - a^2$
$a^2-20a-300/\pi=0$
Use the quadratic formula to find the roots of the quadratic equation that are
a = 12.123, 7.877
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 1 - P.S. Problem Solving - Page 157: 3c
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