This is the 1st of a series of a Non Desargue plane based on Hilbert's "Grundlagen der Geometrie". (Let me call these lines and angles by adding H to them, such as Hlines and Hangles.)
Here are the definitions of line, length and angle. If the slope of Euclidian line AB is positive, it is bend at the base line as below. If the slope is non positive, it is the same as the Euclidian line. HLength is the same as Euclidian. But Hangle between 2 Hlines are defined by the angle of the 2 support lines. Macros of Hsomething can be found in the Toolbar.
