Question

which concept is used to prove that the opposite sides of a parallelogram are congruent? congruent rectangles similar rectangles congruent triangles similar triangles

Explanation:

To prove opposite - sides of a parallelogram are congruent, we draw a diagonal which divides the parallelogram into two congruent triangles. By using the properties of congruent triangles (such as SSS, SAS, ASA, AAS), we can show that the opposite sides of the parallelogram are congruent.

Answer:

C. congruent triangles