Answer
DF$\approx$13.4
Work Step by Step
DF$^2$=DE$^2$+EF$^2$
DF$^2$=144+36
DF=$\sqrt {180}$
DF$\approx$13.4
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 5 - Section 5.4 - The Pythagorean Theorem - Exercises - Page 250: 10b
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