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 8.6 Vectors in Space - 8.6 Assess Your Understanding - Page 645: 2

Answer

xy-plane

Work Step by Step

When $z=0$, then the xy-plane can be defined as the two dimensional plane (2D-plane) which consists of only the $x$ and $y$ coordinates. In other words, we call it the "xy-plane" because all the z-coordinates are zero.
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