Download Section 1.4 Day 2 Angles and Measures

Week 2
Warm Up
1)
3x + 11 = 38
2)
3( 5x – 8 ) = 21
08.22.11
Geometry
1.4 Day 2
P3
I will use angle postulates
Protractor Postulate
The measure of ∠ABC is the absolute
value of the difference between the
numbers of BA and BC.
A
•
Ex 1
B
C
•
Acute
Angle
Ex 2
measuring less than 90º but more than 0º
Right
Angle
Ex 3
angle measuring 90º
Obtuse
Angle
Ex 4
angle measuring more than 90º but
less than 180º
Straight
Angle
Ex 5
angle measuring 180º
Angle
Names
Named for their angle or sides
•
P
Ex 6
•
•
S
R
Q
Q
PQS or
SQP
SQR or
RQS
PQR or
RQP
Name the Vertex and Sides:
H
Ex 7
•
F
Vertex: F
Side: FH
Side: FG
•
G
m
A
The measure of angle A : no stated
points on the rays
Ex 8
A
m ∠ A = 50º
m ∠ BAC
Points on the rays are stated.
Ex 9
50º
50º
Angles are
Congruent
Measures are
Equal
∠BAC ≅ ∠EDF
m∠BAC = m∠EDF
50º = 50º
•
Do 1:
C
•
B
65º
A 115º
115º 65º
•
Is ∠ BAC ≅ ∠ EAD?
E
•
D
Interior
Point
between each side of an angle ( A )
•
B
Ex 10
•
A
Exterior
Point
outside or not on the angle ( B )
Adjacent
Angles
Share a vertex and one side, but no
common points
•
R
•
Q
Ex 11
•
P
S
T
•
∠QSR adjacent to ∠RSP
∠QSR is not adjacent to ∠PST
Review
Do 3:
What is the difference between a
straight angle and a supplementary
angle?
What can be the 3 names of this angle?
H
F
Assignment
•
•
G
Textbook page 29, 1 – 25 all