Alternate Exterior Angles are created where a transversal crosses two (usually parallel) lines. Each pair of these angles are outside the parallel lines, and on opposite sides of the transversal.
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The lines are parallel. When a transversal intersects two lines, corresponding angles, alternate interior angles, and alternate exterior angles are congruent only if the lines are parallel. This is a fundamental property of parallel lines and transversals in geometry.
Complimentary angles are two or more angles that add up to 90 degrees
Supplementary angles are pairs of angles whose measures add up to 180 degrees.
We use it to mean "sides" but the original meaning was "angles."
When two lines are crossed by another line (called the Transversal): The angles in matching corners are called Corresponding Angles.