Trigonometry (11th Edition)
Trigonometry (11th Edition)
11th Edition
ISBN: 9780134217437
Author: Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher: PEARSON
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Concept explainers

Ratios
A ratio is a comparison between two numbers of the same kind. It represents how many times one number contains another. It also represents how small or large one number is compared to the other.
Trigonometric Ratios
Trigonometric ratios give values of trigonometric functions. It always deals with triangles that have one angle measuring 90 degrees. These triangles are right-angled. We take the ratio of sides of these triangles.
Question

Height of a Tree An arborist needs to measure the height of a giant sequoia tree. He
moves some distance along the ground from the base of the tree and measures the
angle of elevation to the top of the tree, which is 79.0 degree . He then backs up another
40.0 feet and measures the angle of elevation to be 72.6 degree . Find the height of the
sequoia tree (Figure 1).

2.6 79.0° 40.0 ft Figure 1
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Transcribed Image Text:2.6 79.0° 40.0 ft Figure 1
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