Trigonometry (10th Edition)

Published by Pearson
ISBN 10: 0321671775
ISBN 13: 978-0-32167-177-6

Chapter 1 - Trigonometric Functions - Section 1.2 Angle Relationships and Similar Triangles - 1.2 Exercises: 60

Answer

14 meters

Work Step by Step

1. This is similar triangles problem. You need to put shadow over shadow and actual height over actual height of the lighthouse $\frac{3.5}{28}=\frac{1.75}{l}$ 2. Solve to find l: $3.5l=49$ $l=14$ 3. Don't forget about units 14 meters
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