Answer
24
Work Step by Step
(.5c)$^2$=20$^2$-16$^2$
(.5c)$^2$=144
.5c=12
c=24
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Cengage
ISBN 10:
978-1-337-61408-5
ISBN 13:
978-1-33761-408-5
Chapter 6 - Review Exercises - Page 315: 13
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