CK-12 Geometry-Concepts

3.4. Alternate Interior Angles http://www.ck12.org

3.4 Alternate Interior Angles

Here you’ll learn what alternate interior 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 inside 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 interior angles.

Watch This

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URL: http://www.ck12.org/flx/render/embeddedobject/52434

CK-12 Foundation: Chapter3AlternateInteriorAnglesA

Watch the portions of this video dealing with alternate interior 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/1339

James Sousa: Proof that Alternate Interior Angles Are Congruent

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Click image to the left for use the URL below.

URL: http://www.ck12.org/flx/render/embeddedobject/1340