No angles are formed on the inside of parallel lines because they do not intersect. That is the definition of parallel.
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If the two lines are parallel, then you get 4 pairs of vertical angles. If the two lines are not parallel, then we get 6 pairs of vertical angles.
There are 56 pairs of congruent angles.
Alternate and supplementary
The angles formed are supplementary, equal corresponding and equal alternate angles
right angle