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English definition of “alternate angle”

alternate angle

noun [C, usually plural]     UK specialized (US alternate angle)
one of two equal angles on opposite sides of a line that crosses two usually parallel (= always the same distance apart) lines, and on opposite sides of those lines → Compare corresponding angleDescribing angles, lines and orientations
(Definition of alternate angle noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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