1. 1-3: Measuring Segments

2. Ruler Postulate Every point on a line can be paired with a real number. This makes a ____________ ___________________ between the points on the line and the real numbers. The real number that corresponds to a point is called the ____________ of the point. one-to-one correspondence coordinate B A What’s the distance between A and B?

3. Distance Formula (on a number line) Take the absolute value of the difference of the coordinates of two points: AB means the distance from A to B Example 1: What is CD? B C D E 2 10

4. Postulate 1-6: If three points A, B and C are collinear and B is between A and C, then: ABABBCBC ACAC Example 2: If LN=32, what are LM and MN? Complete Got It? #2 p.21 Segment Addition Postulate

5. Vocabulary

6. Example 3: is a segment bisector of. What are What do you know? How do you use what you know? Solve Substitute

7. Homework: p. 24 #’s 10-16, 19-22, 25-29, 39, 43, 48-56 even