Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 10 - Geometry - 10.6 Right Triangle Trigonometry - Exercise Set 10.6 - Page 667: 42

Answer

The distance of the ship from the offshore is\[487.68\text{ ft}\]

Work Step by Step

The angle of elevation is the angle made by the horizontal line and the line of object’s sight. Since the angle of elevation opposite to the height of statue and next to the base of the statue, use the tangent ratio formula: \[\tan \theta =\frac{a}{b}\] Where a; is the side opposite to the angle and b is the side adjacent to the angle. Here, a is \[200\text{ ft}\]and b is computed as follows: \[\tan 22.3{}^\circ =\frac{200}{b}\] Therefore, simplifying further, we get, \[\begin{align} & b=\frac{200}{\tan 22.3{}^\circ } \\ & =\frac{200}{0.4101} \\ & =487.68\text{ ft} \end{align}\]
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