complete quadrilateral

Let $A B C D$ be a quadrilateral. Let $\{F\}=AB\bigcap CD$ and $\{E\}=BC\bigcap AD$ . Then $A F C E$ is a complete quadrilateral.

The complete quadrilateral has four sides : $\overline{ABF}$ , $\overline{ADE}$ , $\overline{BCE}$ , $\overline{DCF}$ , and six angles: $A$ , $B$ , $C$ , $D$ , $E$ , $F$ .

Title	complete quadrilateral
Canonical name	CompleteQuadrilateral
Date of creation	2013-03-22 14:05:27
Last modified on	2013-03-22 14:05:27
Owner	vmoraru (1243)
Last modified by	vmoraru (1243)
Numerical id	5
Author	vmoraru (1243)
Entry type	Definition
Classification	msc 51-00