In mathematics, specifically projective geometry, a complete quadrangle is a system of geometric objects consisting of any four points in a plane, no three of which are on a common line, and of the six lines connecting each pair of points. Dually, a complete quadrilateral is a system of four lines, no three of which pass through the same point, and the six points of intersection of these lines. The complete quadrangle was called a tetrastigm by Lachlan (1893), and the complete quadrilateral was called a tetragram; those terms are occasionally still used.
Read more about Complete Quadrangle: Diagonals, Projective Properties, Euclidean Properties
Famous quotes containing the word complete:
“It is easier to live through someone else than to become complete yourself.”
—Betty Friedan (b. 1921)