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al·ter·nate angle(ôltər-nit, al-)
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Tweet n. 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.  (click for a larger image) alternate angleAngles 3 and 6 are alternate interior angles, as are angles 4 and 5. Angles 1 and 8 are alternate exterior angles, as are angles 2 and 7. |
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