In a plane, only one.
Intersecting lines have exactly one point in common, which is the point of intersection. At this point, the two lines cross each other. If lines are parallel, they do not intersect and have no points in common. Lines that are coincident lie on top of each other and share infinitely many points.
3 intersecting lines, because none of the three points are right angles.
Once.
once
4 points of intersection, meaning 4 lines
there are 4 intersecting lines
3 intersecting lines, because none of the three points are right angles.
Once.
once
4 points of intersection, meaning 4 lines
one time
It depends on how many lines intersect. An infinite amount.
It depends on how many lines intersect. An infinite amount.
There are 20 common points.
one solution
If no pair of lines is parallel and if each pairwise intersection is distinct, there will be 499500 points of intersection.
If no pair of lines is parallel and if each pairwise intersection is distinct, there will be 10 points of intersection.