Parallelograms Opposite Angles are Congruent

In today's geometry lesson, we will prove that in parallelograms, the two pairs of opposite angles are congruent.

9.02 Properties of parallelograms, Geometry Math, Texas Geometry - 2020 Edition

Diagonals of Parallelograms, Rectangles, and Rhombi (Video & Practice)

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The prefix Tri means 3. Triangle Trilogy Tricycle Trilingual

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How many congruent sides does a parallelogram have?