1. Essential Question: How can you create formulas to find the distance between two points in all 1-D and 2-D situations?

3. Example 1 Find the length of AB. AB 2.35.4 Example 2 Find the length of CD. CD -5.1 -1.3

4. Postulate 2 Segment Addition Postulate If B is between A and C, the AB + BC = AC. If AB + BC = AC, then B is between A and C. ABC  Ex. 2 Find the distance from Denver to Boston (AC). DenverDetroit Boston A BC AB = 623 miles BC = 500 miles

5. Example 3 Find the distance from Detroit to Boston. DenverDetroit Boston A BC AB = 531 miles AC = 1021 miles

6. Example 4Use the segment addition postulate to find MP. (Two column Proof Format) M NOP Step Reason

7. Example 5Solve for all segment lengths: B is between A and C AB = 4x – 3 BC = 3x + 8 AC = 26