CK-12 Geometry-Concepts

http://www.ck12.org Chapter 3. Parallel and Perpendicular Lines

3.5 Alternate Exterior Angles

Here you’ll learn what alternate exterior angles are and their relationship with parallel lines.

What if you were presented with two angles that are on opposite sides of a transversal, but outside the lines? How
would you describe these angles and what could you conclude about their measures? After completing this Concept,
you’ll be able to answer these questions using your knowledge of alternate exterior angles.

Watch This

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URL: http://www.ck12.org/flx/render/embeddedobject/52443

CK-12 Foundation: Chapter3AlternateExteriorAnglesA

Watch the portions of this video dealing with alternate exterior angles.

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URL: http://www.ck12.org/flx/render/embeddedobject/1328

James Sousa: Angles and Transversals

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URL: http://www.ck12.org/flx/render/embeddedobject/1329

James Sousa: Proof of Alternate Exterior Angles Converse

Guidance

Alternate Exterior Anglesare two angles that are on theexterior oflandm, but on opposite sides of the transversal.

(^61) and (^68) are alternate exterior angles.