Alternate Angles

Pronunciation: /ˈɔl tər nɪt ˈæŋ gəlz/ ?

Two lines intersected by a third line with alternate interior angles highlighted.
Figure 1: Alternate Interior Angles

Alternate angles are angles that are on different sides of a transversal.[1][2] A transversal is a line that intersects two other lines. Alternate interior angles are between the two lines (see figure 1). Alternate exterior angles are outside the two lines (see figure 2).

See also the Alternate Exterior Angles Theorem and the Alternate Interior Angles Theorem.

Two lines intersected by a third line with alternate exterior angles highlighted.
Figure 2: Alternate Exterior Angles

More Information

  • McAdams, David. Transversal. allmathwords.org. Life is a Story Problem LLC. 2010-10-13. http://www.allmathwords.org/article.aspx?lang=en&id=Transversal.

Cite this article as:


Alternate Angles. 2010-10-12. All Math Words Encyclopedia. Life is a Story Problem LLC. http://www.allmathwords.org/en/a/alternateangles.html.

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2010-10-12: Figure 2 was incorrectly identified as figure 1. (McAdams, David.)
2009-12-28: Added "References" (McAdams, David.)
2008-04-17: Initial version (McAdams, David.)

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