Answer
b).
Work Step by Step
Orthogonal is basically a synonym for perpendicular, hence the enclosed angle is $\frac{\pi}{2}$, hence the answer is b).
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 - 9.5 The Dot Product - 9.5 Assess Your Understanding - Page 615: 8
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