Posted by **Sarah** on 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

- Math -
**Reiny**, Sunday, March 7, 2010 at 12:34am
obviously (2)

- Math -
**Sarah**, Sunday, March 7, 2010 at 12:37am
But it does not say that M is the midpoint?

- Math -
**Reiny**, Sunday, March 7, 2010 at 12:41am
One of the fundamental properties of a parallelogram is that its diagonals bisect each other

- Math -
**Sarah**, Sunday, March 7, 2010 at 12:42am
Oh, I understand. Thank you!

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