3.3 proving lines are parallel. parallel postulate through a point p not on line l there is exactly...
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3.3
Proving Lines are Parallel
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Parallel Postulate
Through a point p not on line l there is exactly one line parallel to line l
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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 !!!!
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Can you prove any lines are ||?
d
cb
a
112○
110○112○
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Ex:If x = 3, are the lines \\?
12y+4
14y4x+12
8x
If y = 11 are the lines \\?
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Statement Reason
1. 1.
2. 2.
3. 3.
4. 4.
Given: 1 and 3 are suppProve: m || n
n
m
32
1
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Statement Reason
1. 1.
2. 2.
3. 3.
4. 4.
5. 5.
Given : , 1 3
Prove :
c d
a b2
1
3
d
a
c
b
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Homework Group Problem Solving Packet
(due end of period)3-2 problem solving #4, 53-3 Problem solving ODDS3-3 Prac B ALL
Book work on syllabus