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When two lines are intersected by a third line, if one pair of alternate interior angles formed is congruent, then the two lines are parallel to each other. Two pairs of such alter...

Alternate interior angles are created when a transversal intersects two lines. Each angle is inside the lines, but on opposite sides of the transversal.
If the lines are parallel then the alternate interior angles are equal to each other.

Alternate Interior Angles - Math is Fun

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To help you remember: the angle pairs are on Alternate sides of the Transversal, and they are on the Interior of the two crossed lines.

Definition of Alternate Interior Angles - Math is Fun

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Alternate Interior Angles. more ... When two lines are crossed by another line ( which is called the Transversal), the pairs of angles • on opposite sides of the ...

math.about.com/od/glossaryofterms/g/Definition-Of-Alternate-Angles.htm
Definition: As shown in the image, the two parallel lines are both intersected by another line. Likewise angle 2 and angle 3 are alternate angles and share the same measure of degrees. In geometry, two angles that lie on opposite sides and at opposite ends of a line t... More »
By Deb Russell, About.com Guide

Alternate Interior Angles definition - Math Open Reference

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Alternate Interior Angles are created where a transversal crosses two (usually parallel) lines. Each pair of these angles are inside the parallel lines, and on ...

Mathwords: Alternate Interior Angles

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In the drawing below, angles 3 and 6 are alternate interior angles, as are angles 4 and 5. Alternate interior angles are congruent. Formally, alternate interior ...

Alternate Interior Angles Theorem - Hotmath

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The Alternate Interior Angles Theorem states that, when two parallel lines are cut by a transversal, the resulting alternate interior angles are congruent.

Alternate Interior Angles: Definition, Theorem & Examples | Study.com

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In this lesson, you will learn how to identify alternate interior angles and how to use the theorem to find missing angles and to solve everyday...

Alternate Interior Angles - Concept - Geometry Video by Brightstorm

www.brightstorm.com/math/geometry/reasoning-diagonals-angles-and-parallel-lines/alternate-interior-angles/

Time-saving video on how to identify alternate interior angles formed by a transversal intersecting two parallel lines. Example problems applying alternate ...

Popular Q&A
Q: What are Alternate interior angles?
A: Alternate interior angles are nonadjacent interior angles on opposite sides of the transversal. Read More »
Source: wiki.answers.com
Q: What are Alternating Interior Angles?
A: a / b. _ /_ f / r. /. _c/_d_ t/ s Sorry, I tried to form a digram for your help, but an. /. / alternating interior angle are points (f,d) or (r,c) they are insi... Read More »
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Q: What is alternate interior angles?
A: Alternate Interior Angles are created where a transversal crosses two (usually para... Read More »
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Q: What are alternate interior angles?
A: Alternate interior angles are two interior angles which lie on different parallel Read More »
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Q: What are alternate interior angles?
A: Alternate interior angles in geometry, is when you have 2 parallel lines with 1 crossing both of them, the standard set-up, the angles that are on the alternate... Read More »
Source: answers.yahoo.com