Besides Triangle Geometry there is a geometry of 4 points and/or 4 lines. 
This geometry has its own rules.
There are spectacular points, lines, circles, conics, cubics and transformations typical in the Quadri Enviroment. 
Did you know that the centroid of a Quadrangle differs from the centroid of  
a Quadrilateral?


Perspective Fields

Perspective Fields are fields of related points.
 It is not mere coincident that so many points are collinear in Geometry.
 There is a "hidden structure" . . . . .




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