Homework Help: vector proofs math 536

Posted by dave on Tuesday, October 19, 2010 at 12:22pm.

if the diagonals of quadrilateral ABCD intersect at their midpoints, then the quadrilateral is a parallelogram.
Prove that AM MC
--- = ---
MB MD

Ive tried figuring out this question for a while now and I cant figure it out.

vector proofs math 536 - dave, Tuesday, October 19, 2010 at 12:23pm
*******Prove that AM/BM = MC/MD
vector proofs math 536 - MathMate, Tuesday, October 19, 2010 at 12:37pm
If AC and BD intersect at their mid-points, AM=MC, and BM=MD.
Therefore
AM/MC=BM/MD=1
Transpose to get:
AM/BM=MC/MD

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