A straight line segment can be drawn joining any two points.
It is a consequence of Euclids's parallel postulate.
first five postulate
need a simple explanation of Euclids theory.
Because it will eventually complete a Circle, like the dachshund that met its end going round a lamp-post.
eetrgrv
Euclidean geometry is the study of points, lines, planes, and other geometric figures. The most prolonged argument over time has been that of the parallel postulate which states: there can only be one line that contains a given point and is parallel to another line.
euclids elements
geometry
geometry
compositions
euclids elements
Pythagoras