Answer
Acute angle
Work Step by Step
An angle whose measure is less than $90^{\circ}$ is an acute angle.
Elementary Geometry for College Students (6th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
9781285195698
ISBN 13:
978-1-28519-569-8
Chapter 1 - Section 1.4 - Angles and Their Relationships - Exercises - Page 35: 2c
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