http://www.ck12.org Chapter 3. Parallel and Perpendicular Lines
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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Click image to the left for more content.CK-12 Foundation: Chapter3AlternateInteriorAnglesA
Watch the portions of this video dealing with alternate interior angles.
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Click image to the left for more content.James Sousa:Angles and Transversals
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Click image to the left for more content.James Sousa:Proof that Alternate Interior Angles Are Congruent
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Click image to the left for more content.James Sousa:Proof of Alternate InteriorAngles Converse