google is your friend. You might start here:
https://math.stackexchange.com/questions/1148100/proving-that-lines-from-any-vertex-of-a-parallelogram-to-the-midpoints-of-the-op
Sorry
In the rectangle OABC, M is the midpoint of OA and N is the midpoint of AB. OB meets MC at P and NC at Q. Show that OP=PQ=QB
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