Answer
a). $3rd$ quadrant,
b). $59^{\circ}$ or $1$ radian.
Work Step by Step
a). Since $x=-2.5$ and $y=-4.2$ , the point is in 3rd quadrant.
b). Required angle $\theta=tan^{-1}(\frac{4.2}{2.5}) = 59^{\circ} = 1 radian$
College Physics (7th Edition)
by Wilson, Jerry D.; Buffa, Anthony J.; Lou, Bo
Published by
Pearson
ISBN 10:
0-32160-183-1
ISBN 13:
978-0-32160-183-4
Appendix I - D Trigonometric Relationships - Law of Sines - Appendix I-D Exercises on Trigonometry - Page A-5: 2
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