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Geometry Using Paper Folding

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. Two lines that are always the same distance apart.

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Geometry Using Paper Folding

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  1. Geometry Using Paper Folding Lesson 1.4

  2. Definition • Perpendicular lines When two lines intersect at a right angle B AC BD C A D

  3. Definition • Parallel lines Two lines in the same plane that never intersect. Two lines that are always the same distance apart.

  4. Definition • Parallel lines AC BD A C B D

  5. Definition • Conjecture A statement that you think is true. An “educated guess” based on observation.

  6. Activity 1Perpendicular and Parallel Lines • What kind of lines are l and n? Perpendicular • What kind of lines are mandn? Parallel

  7. 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.

  8. Definition • Segment bisector A line that divides a segment into two congruent parts. B E C A Line BD bisects segment AC. D

  9. Definition • Midpoint The point in the middle of a segment. Divides the segment into two congruent parts. MIDPOINT C B A

  10. Definition • Perpendicular bisector a segment bisector that is perpendicular B C A E Line BD is a perpendicularbisector to segment AC. D

  11. Definition • Angle bisector a segment that bisects an angle. B Segment AD bisects angle BAC D A C

  12. Assignment • A5 • p. 34 # 63, 64, 65 • pp. 39-41 # 5, 25, 26, 33-42 • p. 48 # 29, 30, 34-37 • p. 71-73 # 5-8, 11, 12

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