Answer
There are $90^{\circ}$ in each quadrant, so $30^{\circ}$ north of east is the same as $60^{\circ}$ east of north. Refer to attached image.
Work Step by Step
(a) and (d) are the same
Physics (10th Edition)
by Young, David; Stadler, Shane
Published by
Wiley
ISBN 10:
1118486897
ISBN 13:
978-1-11848-689-4
Chapter 1 - Introduction and Mathematical Concepts - Check Your Understanding - Page 14: 12
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