2 points
the parallel lines never intercept so they do not have any common points.
In Euclidian or plane geometry, there can be only one line through two fixed points. Lines cannot actually be drawn; if you see it it is not a geometric line. If the points are on a curved surface as in a geometry that is non-Euclidian, then there can be infinitely many lines connecting two points.
Rotational symmetry is based on points of rotation not lines
2 lines, I believe.
n - 1
45 points
5 straight lines are needed to construct a pentagon.
If the line is straight, then only one line may connect two points.
ten
10
2 points
You need two points to determine a line. A single point can have an infinite number of lines passing through it.
121
the parallel lines never intercept so they do not have any common points.
6
There are 91 lines.