1. Lesson 1-2 Section 1-4

2. Postulate

3. Definition

4. Example 1

5. Example 2

6. Definition

7. Construction

8. Postulate

9. Example 3

10. Example 4

11. Example 5

12. What about the distance?  We used the ruler postulate for finding the distance between two points on a line, but how can we find the distance of a line in a coordinate plane?  Let’s see…..

13. Definition

14. Example 6

15. Example 7

16. Is there another way?  We have now mastered finding the distance between two points in the coordinate plane. However, there is another way of going about it.  We can use a very famous theorem: The Pythagorean Theorem. Let’s see how we do that….

17. Definition

18. Example 8

19. Example 8 cont.

21. Example 9

22. Practice  Try the following problems:  Pg. 32 # 5-15 odd, 12