Geometry: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281159
ISBN 13: 978-0-13328-115-6

Chapter 8 - Right Triangles and Trigonometry - 8-4 Angles of Elevation and Depression - Practice and Problem-Solving Exercises - Page 519: 12

Answer

$\angle 4$ is at an angle of depression from the horizontal line of the tree to the level of the boat.

Work Step by Step

$\angle 4$ is at an angle of depression from the horizontal line of the tree to the level of the boat. The angle is at a decline from the tree to the boat.
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