how to find the measures of alternate exterior angles?

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It depends on what information you have. The basics are that the alternate exterior angles are congruent. You'll probably see problems that ask you to use this fact. For sample problems, you can watch the other videos on that same page: http://www.brightstorm.com/d/math/s/geometry/u/reasoning-diagonals-angles-and-parallel-lines/t/alternate-exterior-angles/e/alternate-exterior-angles Do you have a specific problem you're trying to solve?