In Exercises 13 to 15,
Given: 

Find: 

To find:
The measure of angles
Given:
In
Figure
Properties used:
Calculation:
In
So,
Thus,
Substitute
Finite Mathematics
Understanding Basic Statistics
Probability and Statistics for Engineering and the Sciences
Calculus: Early Transcendental Functions
Calculus (MindTap Course List)
Precalculus: Mathematics for Calculus (Standalone Book)
Mathematical Applications for the Management, Life, and Social Sciences
Applied Calculus
Calculus: An Applied Approach (MindTap Course List)
Mathematical Excursions (MindTap Course List)
Applied Calculus for the Managerial, Life, and Social Sciences: A Brief Approach
Intermediate Algebra
Single Variable Calculus
Essentials Of Statistics
Elementary Technical Mathematics
Finite Mathematics and Applied Calculus (MindTap Course List)
Statistics for The Behavioral Sciences (MindTap Course List)
Single Variable Calculus: Early Transcendentals, Volume I
Essentials of Statistics for The Behavioral Sciences (MindTap Course List)
Calculus: Early Transcendentals
Multivariable Calculus
Calculus of a Single Variable
Elements Of Modern Algebra
Single Variable Calculus: Early Transcendentals
Contemporary Mathematics for Business & Consumers
Trigonometry (MindTap Course List)
Calculus: Early Transcendental Functions (MindTap Course List)
Study Guide for Stewart's Multivariable Calculus, 8th
Finite Mathematics for the Managerial, Life, and Social Sciences
Study Guide for Stewart's Single Variable Calculus: Early Transcendentals, 8th
Introduction To Statistics And Data Analysis
Research Methods for the Behavioral Sciences (MindTap Course List)
Research Methods for the Behavioral Sciences (MindTap Course List)
STATISTICS F/BUSINESS+ECONOMICSTEXT
Multivariable Calculus
Mathematics For Machine Technology
College Algebra (MindTap Course List)
Statistics for Business & Economics, Revised (MindTap Course List)
Calculus (MindTap Course List)