The three lines in this image are intersecting ... Alternate angles are on opposite sides of the transversal within the parallel lines. Alternate angles are always equal in size.
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Congruent Angles: Definition, Symbol and Key TheoremsAn easy way to remember congruent angles is to relate the word "congruent" and to how that term is used in reference to parallel lines: Two parallel lines with the same measure are congruent.
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