Answer
$72$ feet
Work Step by Step
We have a right angled triangle with base $90$ feet
Base angle $= 38.7^{\circ}$
Now, $\tan ( 38.7^{\circ}) = \dfrac{height}{90}$
height $= 90 \times \tan ( 38.7^{\circ})$
height = $72$ feet
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 4 - Section 4.8 - Applications of Trigonometric Functions - Exercise Set - Page 638: 42
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