Which of the following are necessary when proving that opposite sides of a parallelogram are congruent?
A) corresponding parts of similar triangles are similar
B) alternate interior angles are congruent
C) alternate interior angles are supplementary
D) corresponding parts of congruent triangles are congruent

Question

Which of the following are necessary when proving that opposite sides of a parallelogram are congruent?
A) corresponding parts of similar triangles are similar
B) alternate interior angles are congruent
C) alternate interior angles  are supplementary
D) corresponding parts of congruent triangles are congruent

anonymous · Answer

probably (d). (b) would be used to prove the sides are parallel. (a) and (c) are just incorrect statements from the start