Alternate and supplementary
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a transversal line If a transversal intersects two parallel lines, then the alternate interior angles are congruent.
Alternate and interior angles are created between parallel lines when a transversal line cuts through them.
When a transversal line cuts through parallel lines various angles are created such as equal corresponding angles and equal alternate angles as well as other types of angles.
When parallel lines are cut through by a transversal line the alternate angles are equal
A co-exterior angle is almost the same thing as co-interior:Two angles on the same side of the transversal (in a figure where two parallel lines are intersected by a transversal).They are supplementary angles (add up to 180º).They are exterior angles meaning they are outsideof the two parallel lines (opposite of interior angles which are inside the two parallel lines).