Answer
$\overline{DF}=13$
Work Step by Step
Let $c=\overline{DF}$
$12^{2}+5^{2}=c^{2}$
$144+25=c^{2}$
$169=c^{2}$
$13=c$
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: 10a
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