Euclid's first four postulates are:
He also had the fifth postulate, equivalent to the parallel postulate. There are various equivalent versions.
The fifth postulate cannot be proven and, in fact, it is now known that it cannot be proven and that there are many internally-consistent geometries in which the negations of this postulate are true.
Chat with our AI personalities
If two points are in a plane, then the line that contains the points is in that plane
Points and lines on the same plane are coplanar.
If the question is .. " Points and lines in the same plane "? then the anwser is COPLANER
Points or lines that lie on the same plane are coplanar.
There can be any number of points on a plane, or even on a line - and any number of lines on a plane.