1. Brett Solberg – Alta High ‘11-’12
1.5 Geometry
Brett Solberg – Alta High ‘11-’12

2. Warm-up Identify the following from the picture #1 2 Rays
# Line Segment
# Line
# Parallel Lines
Get out your homework and your notes.

3. Today’s Agenda
Find the length of segments
Review of Cartesian Plane

4. 1-D Distance Formula for finding distance on the number line:
|a – b| a, b numbers
a is the smaller number
Distance AB = | | = |-7 + 4| = |-3| = 3

5. Congruent
To have the same distance.

6. Congruent Segments
Segments with the same distance.
AB CD

7. Equal
Precisely the same in every way =

8. Midpoint
A point that divides a segment into two congruent pieces.

9. Examples

10. Segment Addition Postulate
If A, B, and C are collinear and B is between A and C, then AB + BC = AC

11. Examples

12. Cartesian Plane Rene Descartes 1596 – 1650
French Philosopher and Mathematician
Sickness
Cartesian Plane

13. Cartesian Plane

15. Plot the following points.
(0, 0) (-1, 2) (2, 4) (3, -3) (-1, -1) (-3, 1)

16. Battleship