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Geometryfan (talk | contribs) m →Special cases: Reverted bscl to to original as I do not know how to correctly add Reference 7, p. 169 Tag: Reverted |
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The Varignon parallelogram is a [[rectangle]] if and only if the diagonals of the quadrilateral are [[perpendicular]], that is, if the quadrilateral is an [[orthodiagonal quadrilateral]].<ref name=Josefsson
If a crossing quadrilateral is formed from either pair of opposite parallel sides and the diagonals of a parallelogram, the Varignon parallelogram is a line segment traversed twice.
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