Answer
absolute value; magnitude; argument
Work Step by Step
$r$ is bascially a radius called absolute value or magnitude, whilst the angle $\theta$ is the argument.
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 - 9.3 The Complex Plane; De Moivre's Theorem - 9.3 Assess Your Understanding - Page 594: 6
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