Oh, dude, adjacent lines are like the neighbors of geometry. They just chill next to each other, but they don't necessarily run parallel. So, nah, adjacent lines don't have to be parallel. It's like saying just because you live next to someone, you must be best friends.
_____ lines are parallel and run _____.
None
Adjacent lines are any two lines that meet at a common vertex.
No it doesnt, they are all adjacent but not parallel.
Yes, parallel means that two lines do not cross but lay side-by-side. Perpendicular is the opposite of parallel and means two lines intersecting.