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Geometry Using Paper Folding. Lesson 1.4. Definition. Perpendicular lines When two lines intersect at a right angle. B. AC. BD. C. A. D. Definition. Parallel lines Two lines in the same plane that never intersect. AC. BD. A. C. B. D. Definition. Conjecture

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## Geometry Using Paper Folding

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**Geometry Using Paper Folding**Lesson 1.4**Definition**• Perpendicular lines When two lines intersect at a right angle B AC BD C A D**Definition**• Parallel lines Two lines in the same plane that never intersect. AC BD A C B D**Definition**• Conjecture A statement that you think is true. An “educated guess” based on observation.**Activity 1Perpendicular and Parallel Lines**• What kind of lines are l and n? Perpendicular • What kind of lines are mandn? Parallel**Conjecture**• Complete the following conjecture about parallel and perpendicular lines: If two coplanar lines are perpendicular to the same line, then the lines are parallel.**Definition**Distance from a point to a line: the length of the perpendicular segment from the point to the line.**Definition**• Segment bisector A line that divides a segment into two congruent parts. B E C A D**Definition**• Midpoint The point in the middle of a segment. Divides the segment into two congruent parts. MIDPOINT C B A**Definition**• Perpendicular bisector a segment bisector that is perpendicular to the segment B C A E D**Definition**• Angle bisector a segment that bisects an angle. B D A C

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