1. Measuring Segments and Angles
Notes for Section 1-4
Measuring Segments and Angles

2. We can think of the segment as part of a ___________ line.
To measure a segment, we can use a ruler and measure the distance between the two ____________. OR
We can think of the segment as part of a ___________ line. A B C D E F G H I
- 4
- 3
- 2
- 1 1 2 3 4

3. | | = | | = Look at segment AE
How can we determine the length of segment AE?
The coordinate of A is _______
The coordinate of E is _______
| | =
| | = A B C D E F G H I
- 4
- 3
- 2
- 1 1 2 3 4

4. Two segments with the same ____, denoted __
Congruent Segments
Two segments with the same ____, denoted __
Can you determine some congruent segments from the number line below? A B C D E F G H I
- 4
- 3
- 2
- 1 1 2 3 4

5. Practice 1-4
# 4 - 7

6. An important postulate…….
If three points A, B, and C are _______ and B is between A and C, then ________________.

7. Practice 1-4
# 1 – 3,

8. A midpoint _____ the segment.
A point that divides a segment into two _________ segments.
A midpoint _____ the segment.

9. Z is the midpoint of segment XY, and XY = 27. Find XZ.
Let’s look at the following example.
Z is the midpoint of segment XY, and XY = 27. Find XZ.

10. Practice 1-4 #

11. Angle __________________________
Formed by two _____ with the same endpoint, denoted ___ 1 B C
There are four ways to name this angle.
The endpoint is called the _____ of the angle.
__________________________

12. One way to express the measure of an angle is in _________.
65° B
We would write this as……
______________

13. Angle Measuring Activity

14. An angle with measurement between ____ and ____ degrees.
Acute Angle
An angle with measurement between ____ and ____ degrees.

15. An angle with measurement of _____ degrees.
Right Angle
An angle with measurement of _____ degrees.

16. An angle with measurement between ____ and ___ degrees.
Obtuse Angle
An angle with measurement between ____ and ___ degrees.

17. An angle with measurement of ____ degrees.
Straight Angle
An angle with measurement of ____ degrees.

18. An important postulate……
If point B is in the ________ of AOC,
then _________________________ A B O C

19. Angles with the same ________.
Congruent Angles
Angles with the same ________.
For example… If
____________,
Then
____________

20. Practice 1-4
# 8,