1. Teacher Note
When talking about the midpoint, mention that it BISECTS the line segment

2. Warm Up
Draw the ruler and follow the clues to position the points. Read through ALL the clues before placing any points.

3. HW Answers! (Blue Wrkbk)

4. HW Answers! (Blue Wrkbk)

5. SEGMENT ADDITION POSTULATE
Unit 9 Notes

6. Vocabulary
Coordinate- A point that corresponds to one and only one number on the ruler. Distance- The distance between any two points is the absolute value of the difference of the coordinates. Congruent Segments- segments that have the same length. Tick marks used to show congruence.

7. Ruler Postulate

8. Ex.1 Finding the length of a segment.
Find each length.
DC 𝒎 𝑬𝑭 A. B.

9. N O T A T I O N 𝐴𝐵=20𝑓𝑡 𝐴𝐵 =20𝑓𝑡 𝑚 𝑃𝑄 =9 𝑐𝑚 𝑋𝑀 = 𝐿𝑂 𝑋𝑀 ≅ 𝐿𝑂
𝑃𝑄 + 𝑅𝑆 =12
𝑚 𝐴𝐷 =𝑚 𝑅𝑈
𝑃𝐿+𝑀𝑅=15𝑚𝑚

10. Segment Addition Postulate

11. Ex.2 Using the Segment Addition Postulate
B is between A and C, AC = 14, and BC = Find AB.
Practice:
Y is between X and Z, XZ = 3, and
XY = 𝟏 𝟏 𝟑 . Find YZ.

12. Ex.3 Using the Segment Addition Postulate
AC = 27 Solve for x.

13. Ex.4 Using the Segment Addition Postulate
S is between R and T. Find RT.
Practice: Find DF.

14. Ex.5 Using the Segment Addition Postulate
B is the midpoint of 𝐴𝐶 . AB = 5x and BC= 3x+4. Find: AB = ________ BC = ________ AC = _______
Practice:
S is the midpoint of 𝑅𝑇 , RS = -2x, and ST = -3x – 2. Find RS, ST, and RT.

15. Assignment
Blue Workbook:
page 4-6 #4-6, 11-31
page 7 #5-7