notes for section 1-4
DESCRIPTION
Notes for Section 1-4. Measuring Segments and Angles. 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. 0. 1. 2. 3. 4. - PowerPoint PPT PresentationTRANSCRIPT
Notes for Section 1-4
Measuring Segments and Angles
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
- 4
B C D E F G H I
- 3 - 2 - 1 0 1 2 3 4
A
- 4
B C D E F G H I
- 3 - 2 - 1 0 1 2 3 4
Look at segment AE
How can we determine the
length of segment AE?
The coordinate of A is _______
The coordinate of E is _______
| | = | | =
A
- 4
B C D E F G H I
- 3 - 2 - 1 0 1 2 3 4
Congruent Segments
Two segments with the same ____, denoted __
Can you determine some congruent segments from the number line below?
Practice 1-4
# 4 - 7
An important postulate…….
If three points A, B, and C are _______ and B is between A and C, then ________________.
Practice 1-4
# 1 – 3, 9 - 11
MidpointA point that divides a
segment into two _________ segments.
A midpoint _____ the segment.
Let’s look at the following example.
Z is the midpoint of segment XY, and XY = 27.
Find XZ.
Practice 1-4
# 21 - 22
AngleFormed by two _____ with the same endpoint,
denoted ___
The endpoint is called the _____
of the angle.
A
BC
1
There are four ways to name
this angle.
__________________________
B
One way to express the
measure of an angle is in
_________.65°
We would write this as……
______________
Angle Measuring
Activity
Acute AngleAn angle with
measurement between ____ and ____ degrees.
Right AngleAn angle with
measurement of _____ degrees.
Obtuse AngleAn angle with
measurement between ____ and ___ degrees.
Straight AngleAn angle with
measurement of ____ degrees.
An important postulate……
If point B is in the ________ of AOC,
A
O C
B
then _________________________
Congruent AnglesAngles with the same ________.
For example…
If____________,
Then____________
Practice 1-4
# 8, 12 - 20