Answer
$xy$-plane
Work Step by Step
If $z=0$, then it is called the $xy$-plane because it is like a $2D$ plane with only $x$ and $y$ coordinates.
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 9 - Polar Coordinates; Vectors - 9.6 Vectors in Space - 9.6 Assess Your Understanding - Page 625: 2
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