Answer
$\triangle DEF$ is a Right $\triangle$
Work Step by Step
$\triangle DEF$ is a Right $\triangle$
If one angle of triangle is $ 90^{\circ}$ then triangle is right triangle.
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 2 - Section 2.4 - The Angles of a Triangle - Exercises - Page 97: 9b
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