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What are alternate exterior angles?

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Quick Answer

The angles that lie on the exterior of the intersection created on opposite sides of a paired set of intersecting lines are alternate exterior angles. If the two intersecting lines are parallel, the alternate exterior angles are congruent.

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Full Answer

Mathematicians use properties of alternate exterior angles to find the measurement of an angle or to determine the relationships between intersecting lines.

For example, in a drawing of two parallel lines intersected by a transversal, a person uses the alternate exterior angle value to find the measure of an exterior angle. This theorem also solves the measure of a supplementary angle, as well.

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