Given:  ABCD is a parallelogram. 
Prove: 

Essentials Of Statistics
Multivariable Calculus
Mathematical Excursions (MindTap Course List)
Calculus: Early Transcendentals
Calculus: Early Transcendental Functions
Single Variable Calculus
Calculus (MindTap Course List)
Applied Calculus for the Managerial, Life, and Social Sciences: A Brief Approach
Mathematical Applications for the Management, Life, and Social Sciences
Statistics for The Behavioral Sciences (MindTap Course List)
Finite Mathematics and Applied Calculus (MindTap Course List)
Calculus: An Applied Approach (MindTap Course List)
Elementary Technical Mathematics
Essentials of Statistics for The Behavioral Sciences (MindTap Course List)
Probability and Statistics for Engineering and the Sciences
Applied Calculus
Intermediate Algebra
Understanding Basic Statistics
Finite Mathematics
Precalculus: Mathematics for Calculus (Standalone Book)
Single Variable Calculus: Early Transcendentals, Volume I
Elements Of Modern Algebra
Contemporary Mathematics for Business & Consumers
Trigonometry (MindTap Course List)
Calculus of a Single Variable
Single Variable Calculus: Early Transcendentals
Calculus: Early Transcendental Functions (MindTap Course List)
Study Guide for Stewart's Single Variable Calculus: Early Transcendentals, 8th
Finite Mathematics for the Managerial, Life, and Social Sciences
Study Guide for Stewart's Multivariable Calculus, 8th
Introduction To Statistics And Data Analysis
Mathematics For Machine Technology
Multivariable Calculus
Research Methods for the Behavioral Sciences (MindTap Course List)
STATISTICS F/BUSINESS+ECONOMICSTEXT
Calculus (MindTap Course List)
Statistics for Business & Economics, Revised (MindTap Course List)
College Algebra (MindTap Course List)
Research Methods for the Behavioral Sciences (MindTap Course List)
A First Course in Differential Equations with Modeling Applications (MindTap Course List)
Mathematics: A Practical Odyssey
Modern Business Statistics with Microsoft Office Excel (with XLSTAT Education Edition Printed Access Card) (MindTap Course List)
Functions and Change: A Modeling Approach to College Algebra (MindTap Course List)
Discrete Mathematics With Applications
Essentials Of Statistics For Business & Economics
Calculus Volume 1
Introductory Statistics