Nothing particularly. Just an infinite number of miscellaneous points in the plane.
No angles are formed on the inside of parallel lines because they do not intersect. That is the definition of parallel.
It has no specific name.
None of the sides of any triangle are parallel. However, you can draw an infinite number of parallel lines inside any triangle.
Alternate and supplementary
right angle
they are two angles that are inside two parallel lines
When two lines are parallel, then they do not intersect.
If they were not actually parallel then they would not be parallel lines!
no parallel lines
it has parallel lines
parallel lines are diagonal lines or increasing lines
it means the norm, or the length of something is zero.