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Corresponding Angles (Parallel Lines)
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
Corresponding angles are pairs of angles that:
Are on the same side of the transversal
Are in the same relative position at each intersection
When do they occur?
When a transversal cuts through two lines, corresponding angles form at each point where the transversal crosses a line.
Key fact:
If the two lines are parallel, then the corresponding angles are congruent (equal in measure).
Example:
If transversal t crosses lines l and m, then:
The angle above line l and to the right of the transversal
Corresponds to the angle above line m and to the right of the transversal
These two angles are a pair of corresponding angles.
Video
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