Question

Theorem: If the diagonals of a parallelogram are congruent, then each angle of the parallelogram is a right angle.

Kim is writing the proof of the theorem using the properties of a parallelogram shown below.

The opposite sides of a parallelogram are parallel.


The opposite sides of a parallelogram are congruent.
She proved the theorem by showing that triangle ADC is congruent to triangle CBA using the _________ Postulate.

Answer 1

Well, nomenclature is dependent on the way your class was taught, but I believe the general name of the postulate is the SSS Triangle Congruency Postulate (side-side-side).

Answer 2

Thank you