Question 360602
It's possible to have equal adjacent, supplementary, and complementary (not complimentary...the two are easily confused) angles. Also, you could have equal angles at a point. However, they are not always equal.



It turns out that vertical angles or angles that are vertically opposite one another are always equal.



Note: I'm not sure what you mean by "alternate". Do you mean "alternate interior" or "alternate exterior"?