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Geometry
Section 3.3
Prove Lines are Parallel
Corresponding Angles
Converse
• If two lines are cut
by a transversal so
the corresponding
angles are
congruent, then
the lines are
parallel
1
2
Alternate Interior
Angles Converse
• If two lines are cut
by a transversal so
the alternate
interior angles are
congruent, then
the lines are
parallel
1
2
Alternate Exterior
Angles Converse
• If two lines are cut
by a transversal so
the alternate
exterior angles are
congruent, then
the lines are
parallel
1
1
2
Consecutive Interior
Angles Converse
• If two lines are cut
by a transversal so
the consecutive
interior angles are
supplementary,
then the lines are
parallel
1
2
Examples
• Page 165
• #3, 5, 11, 21, 35
Assignment
• Section 3.3
• Page 165
• Problems #4-14 even, 20, 30, 34, 4044
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