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Parallelogram Requirement (Posted on 2013-07-07) Difficulty: 3 of 5

Let ABCD be a convex quadrilateral.

Prove that ABCD is a parallelogram
if and only if
|AC|2 + |BD|2 = |AB|2 + |BC|2 + |CD|2 + |DA|2.

See The Solution Submitted by Bractals    
Rating: 3.0000 (1 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
SolutionProof. No picture.Jer2013-07-09 11:00:04
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