The Midpoint Quadrilateral Theorem
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The midpoints of the sides of any quadrilateral form a parallelogram. Drag any vertex of the magenta quadrilateral ABCD.
Contributed by: Jay Warendorff (March 2011)
Open content licensed under CC BY-NC-SA
This theorem is also known as Varignon's theorem.
"The Midpoint Quadrilateral Theorem"
Wolfram Demonstrations Project
Published: March 7 2011