13.3 Parallel and Perpendicular Lines. Parallel Lines Coplanar lines that do not intersect.
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13.3 Parallel and Perpendicular Lines
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Transcript of 13.3 Parallel and Perpendicular Lines. Parallel Lines Coplanar lines that do not intersect.
Theorem
• Two nonvertical lines are parallel if and only if their slopes are equal
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21 m
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22 m
21 mm
Theorem
• Two nonvertical lines are perpendicular if and only if the product of their slopes is -1.
121 mm
In english
• That means that the slopes of two perpendicular lines are– Opposite (one + and one -)– Reciprocals ( and )
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2
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Remote Time
The slopes of two lines are given. Are the lines
A: Parallel
B: Perpendicular
C: Neither
D: I don’t know