Prove the midpoints of the sides of a quadrilateral join to form a parallelogram

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Hi Phu, this is Ji. I am asking about one property of a triangle in high School. Do we teach the kids the midsegment of a triangle? Can we use more geometrical method to prove this one or we have to use vectors?

jili
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You are wrong . Because you can prove PS =QR, not PS= -RQ

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