Answer
$\overline{EF}=4$
Work Step by Step
Let $b=\overline{EF}$
$12^{2}=(8\sqrt 2)^{2}+b^{2}$
$144=128+b^{2}$
Subtract 128 on both sides
$16=b^{2}$
$4=b$
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: 9b
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