Definition:Complete Quadrilateral

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Definition

A complete quadrilateral is a quadrilateral whose $4$ lines are extended so as to form $6$ points of intersection.

These $6$ points are joined by a further $3$ diagonals.


Complete-quadrilateral.png


In the above diagram, $AB$, $BC$, $CD$ and $DA$ are the initial $4$ straight lines forming the quadrilateral, whose further intersections are $S$ and $T$.

The point $R$ is the intersection of the two diagonals $AC$ and $BD$.

The third diagonal is $ST$.


Also see

  • Results about complete quadrilaterals can be found here.


Sources