Answer
20.4 feet
Work Step by Step
Applying the Pythagorean theorem:
$$ a^2+b^2=c^2 \\ 20^2 +4^2 = c^2 \\ 400 +16 = c^2 \\ c= \sqrt{416} \\ 20.4 \ feet$$
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 4 - Section 4.3 - The Rectangle, Square, and Rhombus - Exercises - Page 205: 41
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