Answer
$60^\circ$
Work Step by Step
An equilateral triangle has $3$ equal angles and the sum of the $3$ angles of any triangle must equal $180^\circ$, the only way that both statements are true is with the $3$ angles being equal to $60^\circ$.
Trigonometry (10th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671775
ISBN 13:
978-0-32167-177-6
Chapter 2 - Acute Angles and Right Triangles - Section 2.1 Trigonometric Functions of Acute Angles - 2.1 Exercises - Page 53: 79a
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