3. The figure shows a tiling of the plane by parallelograms, which are quadrilaterals having parallel opposite sides. a. Copy the diagram and mark all angles that must be congruent to Z1 if you reason from Postulate 10. b. Mark any additional angles on the diagram that are also congruent to 21, and tell why they are congruent to 21. c. This exercise suggests a theorem about the opposite angles of a parallelogram. State this theorem.

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