Answer
$90^\circ$ is a right angle.
Work Step by Step
An angle with a measure of $90^\circ$ is called a right angle.
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Cengage
ISBN 10:
978-1-337-61408-5
ISBN 13:
978-1-33761-408-5
Chapter 1 - Section 1.2 - Angles and Their Relationships - Exercises - Page 47: 1b
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