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3-4 Parallel and Perpendicular Lines
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Theorem 3-8 If two lines are parallel to the same line, then they are parallel to each other.
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Theorem 3-9 In a plane, if two lines are perpendicular to the same line, then they are parallel to each other
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Problem 1: Solving a Problem with Parallel Lines
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Perpendicular Transversal Theorem
In a plane, if a line is perpendicular to one of two parallel lines, then it is also perpendicular to the other
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Problem 2: Proving a Relationship Between Two Lines
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