1. Warm-up Solve the following problems for x. 13 + 3x – 5 = 2x

2. Segments
Section 1.3

3. Line Segment
Slides 1-3
A line segment consists of two points called endpoints of the segment and all the points between them. A D H
A piece of spaghetti is a physical model of a line segment.

4. Given: Plane Figure Conclusion:
In order for you to say that a point B is between two points A and C, all three points must lie on the same line, and AB + BC = AC.
Slides
Given: Plane Figure
Conclusion:
C: CD + DR = CR

5. Using Segment Addition Postulate, answer the following questions:
Example 1: If DT = 60, find the value of x. Then find DS and ST.

6. Segment Addition Continued:
Example 2: If EG = 100, find the value of x. Then find EF and FG.

7. Example 3: Using the Segment Addition Postulate
M is between N and O. Find NO. 27

8. Example 4: Draw a picture and solve for the missing segment.
B is between A and C, AC = 14 and BC = Find. AB

9. Example 5: Draw a picture and solve for the missing segment.
Find RT if S is between R and T.
RS = 2x + 7, ST = 28 and RT = 4x.

10. Midpoint of a segment:
The midpoint of a segment is the point that bisects, or divides, the segment into two congruent segments.
Example: C is the midpoint of and

11. Segment bisector:
Example 6: BC = 3x + 2 and CD = 5x – 10. Solve for x. What is the length of BD?

12. Segment bisector:
Example 7: AC = 5x - 16 and CF = 2x – 4. Solve for x. What is the length of AF?