Special Cases
The Varignon parallelogram is a rhombus if and only if the two diagonals of the quadrilateral have equal length.
The Varignon parallelogram is a rectangle if and only if the diagonals of the quadrilateral are perpendicular.
Read more about this topic: Varignon's Theorem
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“When we walk the streets at night in safety, it does not strike us that this might be otherwise. This habit of feeling safe has become second nature, and we do not reflect on just how this is due solely to the working of special institutions. Commonplace thinking often has the impression that force holds the state together, but in fact its only bond is the fundamental sense of order which everybody possesses.”
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