1. Lesson 3.5: 1.Warm Up/Homework 2.Constructing Parallel Lines

2. Warm Up: On your own paper, please do the following: p. 161: #9

3. Constructing Parallel Lines: On page 163, there are instructions for constructing parallel lines by using patty paper. Please follow the directions, construct parallel lines and then staple the patty paper into your notes.

4. Constructing Parallel Lines: Now we are going to construct a line parallel to another line through a point not on the line. Follow the steps as you watch me demonstrate. We will add these to your Learning Targets Handout.

5. Steps for Parallel Lines Construction:

6. Group Practice: P. 164: #4 When you finish, write the formula for slope: m =

7. Slopes of Parallel Lines: Parallel Slope Property – In a coordinate plane, two distinct lines are parallel if and only if their slopes are _____________, or they are both vertical lines.

8. Slopes of Perpendicular Lines: Perpendicular Slope Property – In a coordinate plane, two non-vertical lines are perpendicular if and only if their slopes are __________________________________.

9. Example #1:

10. Example #2: Find the slope of each side and then determine whether each figure is a trapezoid, a parallelogram, a rectangle, or just an ordinary quadrilateral.

11. Homework: P. 164-165: 2, 5, 7, 8, 14-16 P. 169: 1, 2, 9