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alternate angle
(ôlˈtər-nĭt, ălˈ-)
noun One of a pair of nonadjacent angles on opposite sides of a transversal that cuts two lines. The angles are both exterior or both interior to the two lines.
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alternate angle
Angles 3,6 and 4,5 are alternate interior angles; angles 1,8 and 2,7 are alternate exterior angles.
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