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Chapter 4

Theorems 9-15
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Theorem 9
If two parallel lines are cut (crossed) by a transversal, then their corresponding angles are congruent
Theorem 10
If the two angles in a linear pair have equal measures (are congruent), then each is a right angle
Theorem 11
If two parallel lines are cut (crossed) by a transversal, then their alternate exterior angles are congruent
Theorem 12
If two parallel lines are cut (crossed) by a transversal, then interior angles on the same side of the transversal are supplementary
Theorem 13
If two lines form congruent corresponding angles with a transversal, then the lines are parallel
Theorem 14
If two lines form congruent alternate exterior angles with a transversal, then the lines are parallel
Theorem 15
If two lines form supplementary interior angles on the same side of the transversal, then the lines are parallel