Even 6
Point, Line, Incident, Congruent, Between and Plane
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Line,point
point,line,and plane
Point, line and plane.
Undifined terms are terms that don't and can't be broken down any more. Three examples: point, line, plane.
There are different geometries but in the most intuitive one, Euclidean Geometry, the undefined "objects" are point, line and plane while incidence, congruence and being between are undefined concepts.