1. 1-2 Measuring and Constructing Segments Warm Up Lesson Presentation
Lesson Quiz
Holt McDougal Geometry
Holt Geometry

2. Warm Up Simplify. 1. 7 – (–3) 2. –1 – (–13) 3. |–7 – 1|
1. 7 – (–3)
2. –1 – (–13)
3. |–7 – 1|
Solve each equation.
4. 2x + 3 = 9x – x = 4x – 5
6. How many numbers are there between and ? 10 12 8 2 5
Infinitely many

3. Objectives Use length and midpoint of a segment.
Construct midpoints and congruent segments.

4. A point corresponds to __________ number on a number line/ruler.
one
A point corresponds to __________
number on a number line/ruler.
The number is called a _____________.
coordinate

6. B) The distance between any two points is the ________________of the difference of the coordinates.
The distance is also called the ________.
absolute value
length A -5 B 4
AB = |-5 – 4| = |-9| = 9

7. C) _________________ are segments that have the same length.
__________are used in a figure to show congruent segments.
Congruent segments
Tick marks

8. 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.

9. B is between A and C, AC=14, and BC=11. Find AB.
Example 1
B is between A and C, AC=14, and BC=11. Find AB.

10. Example 2
Ex 2: S is between R and T.
RS=2x+7, RT=28, and ST=4x.
Find x and RT.

11. midpoint
D) The _________, M, of AB is the point that ________, or divides, the segment into two congruent segments.
bisects A M B

12. A segment bisector is any ray, segment, or line that intersects in a segment as its midpoint.
It divides the segment into two equal parts at its midpoint.

13. B is the midpoint of AC. AB=5x, and BC=3x+4. Find x and AC.
Example 3
B is the midpoint of AC. AB=5x, and BC=3x+4. Find x and AC.

14. S is the midpoint of RT. RS=-2x and RT=-6x-4. Find x, RS, and ST.
Example 4
S is the midpoint of RT. RS=-2x and RT=-6x-4. Find x, RS, and ST.