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OpenStudy (anonymous):
What is the reason for the third step in this proof? Corresponding sides of congruent triangles are equal in length. The diagonals of a rectangle bisect each other. SSS criterion for congruence Opposite sides of a parallelogram are congruent.
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Directrix (directrix):
@jwatts45 Please post the proof so that we can see the third step.
OpenStudy (anonymous):
Opposite sides of a parallelogram are congruent.
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