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alternate angles

noun
🔊/ɔːlˌtɜːnət ˈæŋɡlz/
🔊/ˌɔːltərnət ˈæŋɡlz/
[plural] (geometry几何)
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  1. equal angles formed on opposite sides of a line that crosses two parallel lines, in the position of the inner angles of a Z （内）错角
    compare corresponding angles