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
Famous quotes containing the words special and/or cases:
“And weren’t there special cemetery flowers,
That, once grief sets to growing, grief may rest:
The flowers will go on with grief awhile,
And no one seem neglecting or neglected?
A prudent grief will not despise such aids.”
—Robert Frost (1874–1963)
“I do not believe in lawyers, in that mode of attacking or defending a man, because you descend to meet the judge on his own ground, and, in cases of the highest importance, it is of no consequence whether a man breaks a human law or not. Let lawyers decide trivial cases.”
—Henry David Thoreau (1817–1862)