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Corresponding Angles Theorem
If two lines are parallel, corresponding angles are congruent
Alternate Interior Angles Theorem
If two lines are parallel, alternate interior angles are congruent
Alternate Exterior Angles Theorem
If two lines are parallel, alternate exterior angles are congruent
Consecutive Interior Angles Theorem
If two lines are parallel, consecutive interior angles are supplementary (add to 180°)
Corresponding Angles Converse
If corresponding angles are congruent, the lines are parallel
Alternate Interior Angles Converse
If alternate interior angles are congruent, the lines are parallel
Alternate Exterior Angles Converse
If alternate exterior angles are congruent, the lines are parallel
Consecutive Interior Angles Converse
If consecutive interior angles are supplementary (add to 180°), the lines are parallel