Lesson_3-1_Lines_and_Angles

Lesson_3-1_Lines_and_Angles - Lines and Angles Lesson 3-1...

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Lines and Angles Lesson 3-1
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Parallel Lines Coplanar lines that do not intersect Symbol  means parallel to Arrows indicate in diagrams lines that are parallel m n m  n
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Parallel Lines m n Parallel Lines
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Skew Lines Noncoplanar lines that do not intersect Skew lines are not parallel and do not intersect
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Skew Lines m n Skew Lines
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Example 1 Identify segments parallel to DF: A B C D E F G H
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Example 2 Identify segments parallel to AB: A B C D E F G H
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Transversal Transversal A line that intersects two or more coplanar lines
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Two Lines/Transversal – Angles 1 2 8 7 3 4 5 6
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Exterior Angles 1 2 8 7 Exterior Angles are those angles outside of the two lines .
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Interior Angles 4 3 6 5 Interior Angles are those angles inside of the two lines .
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Same-Side Interior Angles 4 3 6 5 Same-Side Interior Angles lie on the same side of the transversal and inside the two lines . (Consecutive Interior Angles)
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Alternate Interior Angles 4 3 6 5 Alternate Interior Angles lie on the opposite sides of the transversal and inside the two lines .
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Parallel Lines – Alternate Exterior Angles
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