Answer
$90^{\circ}$
Work Step by Step
1. Subtract 360 degrees twice to get smallest positive coterminal angle
$810^{\circ}-720^{\circ}=90^{\circ}$
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 1 - Test - Page 44: 10c
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