I'm Beside Myself
Definition 23
Parallel straight lines are straight lines which, being in the same plane and being produced indefinitely in both directions, do not meet one another in either direction.
All these definitions and we finally have parallel! Easy enough, parallel lines are lines in a plane that never meet. We learned previously that parallel lines have the same slope also.
We don't have a tool yet for parallel, we will but we have to earn it first!