Answer
$XY=10 \sqrt 2$
Work Step by Step
Using the Special Right Triangle 45-45-90 we know that both legs will be equal. So...
$XZ=ZY=10$
The third side, or the hypotenuse will be the side length times $\sqrt 2$
Therefore...
$XY=10 \sqrt 2$
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 - Test - Page 275: 10a
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