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

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 $60^\circ$.

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