Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Chapter 8 - Polar Coordinates; Vectors - Section 8.1 Polar Cordinates - 8.1 Assess Your Understanding - Page 592: 57



Work Step by Step

The point $(-1,0)$ lies on the $x$-axis a distance of $1$ unit from the pole (origin), so $r=1$. A ray with vertex at the pole through $(-1,0)$ forms an angle $\theta=\pi$ (counterclockwise) with the polar axis. Polar coordinates for this point can be given by $(1,\pi)$.
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