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Corresponding Angles Theorem
See It in Action
Two examples of the idea done right—and one common look-alike that is not right.
EXAMPLE
EXAMPLE
NON-EXAMPLE
Definition
The Corresponding Angles Theorem states:
“If two parallel lines are cut by a transversal, then each pair of corresponding angles is congruent.”
In simpler terms:
When a transversal crosses two parallel lines,
The angles that are in the same relative position at each intersection point
Are equal in measure.
Example:
If line l is parallel to line m, and transversal t crosses them, then:
The angle above line l and to the right of the transversal
Is congruent to the angle above line m and to the right of the transversal
These are corresponding angles, and by the theorem, they are congruent.
Video
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