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Which of the following are necessary when proving that the opposite sides of a parallelogram are congruent? Check all that apply.

1. Opposite sides are perpendicular.

2. Opposite sides are parallel.

3. Alternate interior angles are supplementary.

4. Alternate interior angles are congruent.​

Respuesta :

Answer: b and d are it

Answer: 2 and 4

2-Opposite sides are parallel.

4-Alternate interior angles are congruent.