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Angle Addition Postulate & Corresponding parts of congruent triangles are congruent.
Alternate interior angles are congruent (C) & Corresponding parts of congruent triangles are congruent (D) are necessary when proving that the opposite sides of a parallelogram are congruent.
Choosing from the following list of options:
A. Corresponding parts of similar triangles are similar.
B. Alternate interior angles are supplementary.
C. Alternate interior angles are congruent.
D. Corresponding parts of congruent triangles are congruent.