Post on 30-Jan-2016
description
Warm Up 08.22.11Week 2
1) 3x + 11 = 38
2) 3( 5x – 8 ) = 21
Geometry1.4 Day 2
I will use angle postulates
A
C•
•
B
Ex 1
P 3 Protractor Postulate
The measure of ∠ABC is the absolute value of the difference between the numbers of BA and BC.
Acute Angle
measuring less than 90º but more than 0º
Ex 2
Right Angle
angle measuring 90º
Ex 3
Obtuse Angle
angle measuring more than 90º but less than 180º
Ex 4
Straight Angle
angle measuring 180º
Ex 5
•P
•S•RQ
Named for their angle or sides
PQS or SQP
SQR
RQS
PQR RQPor
or
Q
Ex 6
Angle Names
Name the Vertex and Sides:
•G
F
H•
Vertex: F
Side: FH
Side: FG
Ex 7
m The measure of angle A : no stated points on the rays
A
A
m ∠ A = 50º
Ex 8
Points on the rays are stated.m ∠ BAC
∠BAC ≅ ∠EDF
Angles are Congruent
Measures are Equal
m∠BAC = m∠EDF
50º 50º
50º = 50º
Ex 9
Do 1:
65º
65º•B A
C•
•
•
D
E
Is ∠ BAC ≅ ∠ EAD?
115º
115º
A
Interior Point
between each side of an angle ( A )
•
Exterior Point
outside or not on the angle ( B )
B•Ex 10
Ex 11
∠QSR adjacent to ∠RSP
•R
•P
•TS•Q
Adjacent Angles
Share a vertex and one side, but no common points
∠QSR is not adjacent to ∠PST
Review
Assignment
Textbook page 29, 1 – 25 all
What is the difference between a straight angle and a supplementary angle?
Do 3:
•G
F
H•
What can be the 3 names of this angle?