Elementary Geometry for College Students (5th Edition)

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

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.
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