Angles associated with parallel and non-parallel lines

Investigate the angles associated with parallel and non-parallel lines.[br][br]Move lines AB, CD or EF or GH.
What do you notice?
Name 2 angles that are congruent and why they are congruent.
Name 2 different angles that are congruent and why they are congruent.
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Information: Angles associated with parallel and non-parallel lines