Answer
$\angle$ABC = OBTUSE ANGLE
$\angle$DEF = ACUTE ANGLE
Work Step by Step
$\angle$ABC = OBTUSE ANGLE SINCE GREATER THAN 90
$\angle$DEF = ACUTE ANGLE SINC LESS THAN 90
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
Appendix A - A.3 - Inequalities - Exercises - Page 553: 3
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