If two lines in the same plane do not intersect, then they must be parallel.

Distance between two parallel lines is not same everywhere.

If $m\perp l, n\perp l$ and $m\ne n$, then $m\left|\right|n$.

Two non-intersecting coplanar rays are parallel.

If ray $AB\Vert$ line $m$, then line segment $AB \left|\right| m$.

If line $AB\Vert$ line $m$, then line segment $A B \left|\right| m.$

No two parallel segments intersect.

Every pair of lines is a pair of coplanar lines.

Two lines perpendicular to the same line are parallel.