alternate angle

Angles 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.

al·ter·nate angle

(ôl′tər-nĭt, ăl′-)

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.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

al′ternate an′gle

one of a pair of nonadjacent angles made by the crossing of two lines by a third line.

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References in periodicals archive

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