Answer
24
Work Step by Step
(.5c)$^2$=20$^2$-16$^2$
(.5c)$^2$=144
.5c=12
c=24
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 6 - Review Exercises - Page 319: 13
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