3.3 Proving Lines are Parallel. Parallel Postulate Through a point p not on line l there is exactly one line parallel to line l.

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Presentation transcript:

3.3 Proving Lines are Parallel

Parallel Postulate Through a point p not on line l there is exactly one line parallel to line l

Converse Thms about Parallel Lines  If corresponding angles are congruent …  If alternate exterior angles are congruent …  If alternate interior angles are congruent …  If same-side interior angles are supplementary … Then, the lines are parallel !!!!

Can you prove any lines are ||? d c b a 112 ○ 110 ○ 112 ○

Ex: If x = 3, are the lines \\? 12y+4 14y 4x+12 8x If y = 11 are the lines \\?

StatementReason

StatementReason d a c b

Homework Group Problem Solving Packet (due end of period)  3-2 problem solving #4, 5  3-3 Problem solving ODDS  3-3 Prac B ALL Book work on syllabus