Given:  Quadrilateral

Prove: 

(See the figure at the top of the next column) 
Understanding Basic Statistics
Calculus (MindTap Course List)
Calculus: An Applied Approach (MindTap Course List)
Intermediate Algebra
Multivariable Calculus
Calculus: Early Transcendentals
Finite Mathematics
Probability and Statistics for Engineering and the Sciences
Mathematical Applications for the Management, Life, and Social Sciences
Applied Calculus
Precalculus: Mathematics for Calculus (Standalone Book)
Essentials Of Statistics
Applied Calculus for the Managerial, Life, and Social Sciences: A Brief Approach
Finite Mathematics and Applied Calculus (MindTap Course List)
Essentials of Statistics for The Behavioral Sciences (MindTap Course List)
Single Variable Calculus: Early Transcendentals, Volume I
Single Variable Calculus
Statistics for The Behavioral Sciences (MindTap Course List)
Calculus: Early Transcendental Functions
Mathematical Excursions (MindTap Course List)
Elementary Technical Mathematics
Elements Of Modern Algebra
Calculus of a Single Variable
Trigonometry (MindTap Course List)
Contemporary Mathematics for Business & Consumers
Single Variable Calculus: Early Transcendentals
Elementary Geometry for College Students
Calculus: Early Transcendental Functions (MindTap Course List)
Finite Mathematics for the Managerial, Life, and Social Sciences
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)
Calculus (MindTap Course List)
Research Methods for the Behavioral Sciences (MindTap Course List)
College Algebra (MindTap Course List)
Statistics for Business & Economics, Revised (MindTap Course List)
Mathematics For Machine Technology
Multivariable Calculus
STATISTICS F/BUSINESS+ECONOMICSTEXT
Introduction To Statistics And Data Analysis
Mathematics: A Practical Odyssey
Essentials Of Statistics For Business & Economics
Functions and Change: A Modeling Approach to College Algebra (MindTap Course List)
Discrete Mathematics With Applications
Modern Business Statistics with Microsoft Office Excel (with XLSTAT Education Edition Printed Access Card) (MindTap Course List)
Introductory Statistics
College Algebra
A First Course in Differential Equations with Modeling Applications (MindTap Course List)