Trigonometry (10th Edition)

Published by Pearson

Chapter 1 - Trigonometric Functions - Section 1.1 Angles - 1.1 Exercises: 117

Answer

-90$^{\circ}$ is between 3rd and 4th quadrants.

Work Step by Step

Coterminal angles always in the same quadrant with original angle, therefore -90$^{\circ}$+360$^{\circ}$=270$^{\circ}$ -90$^{\circ}$-360$^{\circ}$=-450$^{\circ}$

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