Answer
1. In a parallelogram, opposite sides are parallel.
2. Thus, two opposite angles in parallelograms are corresponding angles.
3. Corresponding angles are congruent.
4. Thus, opposite angles of parallelograms are congruent.
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 4 - Section 4.1 - Properties of a Parallelogram - Exercises - Page 185: 27
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