Geometry Unit 3 Lesson 3 (10/1)

 Lesson 3:
Slopes of Lines
 Section 3.3
 Virginia SOL Standard G.3.ab
 The student will use pictorial representations, including computer software, constructions, and coordinate methods, to solve problems involving symmetry and transformation. This will include
 a)  investigating and using formulas for finding distance, midpoint, and slope;
 b)  applying slope to verify and determine whether lines are parallel or perpendicular;
New Definitions

Slope

Rate of Change

 New Postulates
 Postulate 3.2: Slopes of Parallel Lines
 Postulate 3.3: Slopes of Perpendicular Lines

 

 New Theorems
 None Today
 Lesson 3 Objectives

The student will be able to…

1.Find slopes of lines.
2.Use slope to identify parallel and perpendicular lines.
 Warm Up
 Pick a partner.
 You have a job: make sure you are on task.
 You have a second job: make sure your partner is on task (and awake).
 For anyone off task, both partners will be held responsible.
 Warm up
 Do this on a clean page in your notes.
 Warm up
 Warm up
 Warm up
 Find the slope in three steps
 Find the slope in three steps
 Find the slope
 Find the slope
 Find the slope
 Find the slope
 Find the slope
 Same Slope?
 Positive or Negative?
 Positive or Negative?
 Positive or Negative?
 Positive or Negative?
 Positive or Negative?
 Positive or Negative?
 Positive or Negative?
 Parallel Lines
 Parallel lines have the same slope.
 Perpendicular Lines
 Perpendicular lines have slopes that are negative inverses:
 Ex: 〖slope〗_(1 )=3/2
 And 〖slope〗_(2 )=(-2)/3
 Homework
 p. 190-191 – #13-31 odd
 p. 194 – #62- 65
 DUE Wednesday 10/2

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