Trusses are frequently used to support roofs on buildings. The simplest type of roof truss is a triangle, as shown in the figure. One basic task when constructing a roof truss is to cut the ends of the rafters so that the roof has the correct slope. Use part (b) of the figure to determine the measure of angle B. Hint You have three versions of the Law of Cosines from which to choose: only one of them contains the angle for which you are solving! 116
Trusses are frequently used to support roofs on buildings. The simplest type of roof truss is a triangle, as shown in the figure. One basic task when constructing a roof truss is to cut the ends of the rafters so that the roof has the correct slope. Use part (b) of the figure to determine the measure of angle B. Hint You have three versions of the Law of Cosines from which to choose: only one of them contains the angle for which you are solving! 116
Trigonometry (11th Edition)
11th Edition
ISBN:9780134217437
Author:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Chapter1: Trigonometric Functions
Section: Chapter Questions
Problem 1RE:
1. Give the measures of the complement and the supplement of an angle measuring 35°.
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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.
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