Given: 

Find: 

To find:
The value of
Given:
And,
The Figure (1) is given as,
Figure (1)
Definition:
The pair of nonadjacent angles in the opposite direction that lie on two intersecting straight lines is called vertical angles.
Calculation:
The angle
Substitute
Statistics for The Behavioral Sciences (MindTap Course List)
Finite Mathematics
Multivariable Calculus
Finite Mathematics and Applied Calculus (MindTap Course List)
Calculus: Early Transcendental Functions
Calculus: Early Transcendentals
Essentials Of Statistics
Single Variable Calculus: Early Transcendentals, Volume I
Mathematical Applications for the Management, Life, and Social Sciences
Calculus (MindTap Course List)
Applied Calculus
Applied Calculus for the Managerial, Life, and Social Sciences: A Brief Approach
Understanding Basic Statistics
Intermediate Algebra
Elementary Technical Mathematics
Probability and Statistics for Engineering and the Sciences
Precalculus: Mathematics for Calculus (Standalone Book)
Mathematical Excursions (MindTap Course List)
Single Variable Calculus
Calculus: An Applied Approach (MindTap Course List)
Essentials of Statistics for The Behavioral Sciences (MindTap Course List)
Trigonometry (MindTap Course List)
Single Variable Calculus: Early Transcendentals
Elements Of Modern Algebra
Contemporary Mathematics for Business & Consumers
Calculus of a Single Variable
Finite Mathematics for the Managerial, Life, and Social Sciences
Calculus: Early Transcendental Functions (MindTap Course List)
Study Guide for Stewart's Multivariable Calculus, 8th
Study Guide for Stewart's Single Variable Calculus: Early Transcendentals, 8th
Research Methods for the Behavioral Sciences (MindTap Course List)
Mathematics For Machine Technology
STATISTICS F/BUSINESS+ECONOMICSTEXT
Multivariable Calculus
Research Methods for the Behavioral Sciences (MindTap Course List)
Calculus (MindTap Course List)
Statistics for Business & Economics, Revised (MindTap Course List)
College Algebra (MindTap Course List)
Introduction To Statistics And Data Analysis