1. The problem statement, all variables and given/known data The question states True or False: Two lines parallel to a third line are parallel 2. Relevant equations You need to know the difference between skew, parallel and perpendicular 3. The attempt at a solution I thought of three parallel planes (which have an infinite amount of lines) and those lines never cross as long as they stay on their separate planes. But do parallel lines have to be in the same direction?