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**3.1 Identify Pairs of Lines and Angles**

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**Parallel Lines Coplanar Do not intersect**

Triangles, like those above in red, indicate that 2 lines are parallel. D B Coplanar Do not intersect Segments and rays are parallel if they lie on parallel lines. C

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**Parallel planes if they never intersect**

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B C D A F G E H

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B C A D F G E H

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**Skew Lines: Do not intersect, but do not lie in the same plane.**

G C B

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A D E H G C B F

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B C D A F G E H

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#13: Parallel Postulate If there is a line and a point not on the line,

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#13: Parallel Postulate If there is a line and a point not on the line, then there is exactly one line through the point and parallel to the line

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**#14: Perpendicular Postulate**

If there is a line and a point not on the line, then there is exactly one line through the point and perpendicular to the line

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**Corresponding Angles Same side of transversal Corresponding position**

Transversal; intersects 2 or more coplanar lines Corresponding Angles Same side of transversal Corresponding position

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Alternate Exterior Angles “Alternate” opposite sides of transversal “Exterior” outside of the two lines

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Alternate Interior Angles “Alternate” opposite sides of transversal “Interior” inside of the two lines

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Consecutive Interior Angles “Consecutive” “together”; same side of the transversal “Interior” inside of the two lines

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A#20: Page 150 #

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3-1 Lines and Angles. Parallel and Skew Parallel lines are coplanar lines that do not intersect. – The symbol means “is parallel to”. Skew lines are.

3-1 Lines and Angles. Parallel and Skew Parallel lines are coplanar lines that do not intersect. – The symbol means “is parallel to”. Skew lines are.

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