Varignon's theorem: Difference between revisions

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Proof: Put an actual understandable proof first.
Adding short description: "The midpoints of the sides of an arbitrary quadrilateral form a parallelogram" (Shortdesc helper)
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{{short description|The midpoints of the sides of an arbitrary quadrilateral form a parallelogram}}
{{for|the theorem about the moment of a force|Varignon's theorem (mechanics)}}
[[Image:Varignon parallelogram convex.svg|thumb|300px|Area(''EFGH'') = (1/2)Area(''ABCD'')]]