Concurrent lines
If some lines go through the same point, then they are concurrent.
Any 2 lines which are not parallel intersect at some point, so any 2 non-parallel lines are concurrent.
3 or more lines may or may not go through the same line.
To determine if 3 or more lines are concurrent, we find the point of intersection of two of these lines, and then see whether this point lies on the other lines.
