Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 13, Trigonometric Ratios and Functions - 13.3 Evaluate Trigonometric Functions of Any Angle - 13.4 Exercises - Problem Solving - Page 879: 38c

Answer

$7.01$ ft

Work Step by Step

We have the ratio of $\dfrac{\sin \theta_1 }{\sin \theta_2 }=1.333$ Now, $\dfrac{\sin 70^{\circ} }{\sin \theta_2 }=1.333$ Re-write as: $\theta_2 = \sin^{-1} [ \dfrac{\sin 70^{\circ} }{1.333}]$ This implies that $ \theta_2 \approx 44.83^{\circ}$ Now, $x = 4 \tan \theta_2 =4 \tan 44.83^{\circ} \approx 3.98 $ft and $y = 4 \tan \theta_1 =4 \tan 70^{\circ} \approx 10.99 $ft Further, $d = y-x = 10.99 -3.98 =7.01$ ft
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