1. Ch3.2_TypesOfAngles.notebook September 27, 2011
Chapter 3.2
Types of Angles
Types of Angles
Postulate 7
Right ­ exactly 900
Protractor Acute ­ less than 900
Obtuse ­ greater than 900 less than 1800
Straight ­ exactly 1800
Complementary ­ 2 or more angles that
add up to 900
Supplementary ­ 2 or more angles that
add up to 1800
Postulate 8
"Angle Addition Postulate" Find the angle measures
<AXB + BXC = AXC
< <
A
B
800
400
X C
These angles are ADJACENT angles.
They share a vertex and a side

2. Ch3.2_TypesOfAngles.notebook September 27, 2011
Example Example
Solve for X
The measure of <XYZ is 150 less than
twice the measure of its supplement.
Find the measure of angle XYZ
30o
X
Example Example
Solve for X Solve for X
34o ____0
X
o X 50 o
30
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