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posted by Sarah Sunday, March 7, 2010 at 12:08am.

In parallelogram PQRS, diagonals PR and QS intrsect at M. Which is always true? (1) PR is perpendicular to QS (2) PM is congruent to RM (3) PQ is congruent to QR (4) triangle PMS is congruent to triangle PMQ

obviously (2)

But it does not say that M is the midpoint?

One of the fundamental properties of a parallelogram is that its diagonals bisect each other

Oh, I understand. Thank you!

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