Answer
$\triangle XYZ$ is obtuse.
Work Step by Step
In given $\triangle XYZ$ m$\angle X=123^{\circ}$
One obtuse angle is given.
$\triangle XYZ$ is obtuse.
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: 10a
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