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Perpendicular Lines SECTION 2.5

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Definition Perpendicular lines are two lines that intersect to form right angles (90o).

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**Perpendicular THEOREM**

Perpendicular lines form adjacent angles.

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**2x + 10 + x – 7 = 90o 3x + 3 = 90o 3x = 87o x = 29o 2x + 10 x – 7**

DRAW THIS FIRST 2x + 10

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9x – x = 180o 11x – 18 = 180o 11x = 198o x = 18o DRAW THIS FIRST 9x – 18 2x

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**Name the theorem or state the definition that justifies the statement below.**

Definition of ⏊ ⏊ Theorem ⏊ Theorem

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Now work! Written Exercises Page 58-59 #3 – 12, 18 – 25

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PRACTICE PROBLEMS PAGE 57 Classroom Exercises #2-11 Line Song

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