Chapter 3.1 Properties of Parallel Lines
2.0 Students write geometric proofs4.0 Students prove basic theorems involving
congruence7.0 Students prove and use theorems involving the
properties of parallel lines cut by a transversal
Corresponding Angles Postulate
• If a transversal intersects two parallel lines, then corresponding angles are congruent
Alternate Interior Angles Theorem
• If a transversal intersects two parallel lines, then alternate interior angles are congruent
Same-Side Interior Angles Theorem
• If a transversal intersects two parallel lines, then same side interior angles are supplementary
Alternate Exterior Angles Theorem
• If a transversal intersects two parallel lines, then alternate exterior angles are congruent
Same-side Exterior Angles Theorem
• If a transversal intersects two parallel lines, then same side exterior angles are supplementary
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