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  1. Oxford American Dictionary

    alternate angles

    • IPA[ˈôltərˌnāt ˈaNGɡəlz]

    美式

    • plural
      two angles, not adjoining one another, that are formed on opposite sides of a line that intersects two other lines. If the original two lines are parallel, the alternate angles are equal.

    • noun: alternate angle, plural noun: alternate angles