Think about it,
the x & y planes intersect and what one number has both,
the x & y planes intersect.
0 on the coordinate plane is the,
origin.
Chat with our AI personalities
Coplanar lines that do not intersect are parallel. Non-coplanar lines that do not intersect are called skew lines.
If the lines are in the same plane and never intersect they are always parallel. Two line can not intersect and be parallel if they are in different planes though. Take a cube for example, if you have one Sid of it and take the edge and then go to the opposite side and make a horizontal line they will never intersect but are also not parallel.
Parallel lines NEVER touch, so zero.
Two planes that intersect are simply called a plane to plane intersection. When they intersect, the intersection point is simply called a line.
Two coplanar lines that never intersect are called called parallel lines.