The three diagonal points of a complete quadrilateral are never collinear.
Fano's Axiom
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Cite this as:
Weisstein, Eric W. "Fano's Axiom." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/FanosAxiom.html
The three diagonal points of a complete quadrilateral are never collinear.
Weisstein, Eric W. "Fano's Axiom." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/FanosAxiom.html