Postulate 3-1, Theorems 3-(1,2,3)
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Alternate Exterior Angles Theorem (3-3)
If a transversal intersects two parallel lines, then alternate exterior angles are congruent.
Alternate Interior Angles Theorem (3-1)
If a transversal intersects two parallel lines, then alternate interior angles are congruent
Corresponding Angles Postulates (postulate 3-1)
If a transversal intersects two parallel lines, then corresponding angles are congruent
Same-Side Interior Angles Theorem (3-2)
If a transversal intersects two parallel lines, then same-side interior angles are supplementary