They are if parallel lines are cut by a transversal that's perpendicular to them.
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They are supplementary angles / The sum of their measures are 180 degrees.
There are 4 types which are:- 1 Corresponding equal angles 2 Alternate equal angles 3 Vertical opposite equal angles 4 Interior supplementary or allied angles
Yes. Alternate interior and alternate exterior angles are congruent.
Alternate interior angles are equal on a transversal that passes through parallel lines.
Alternate and supplementary