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Geometry
1.4 Notes
Angles and Their Measures
Objectives: Use angle postulates and become familiar with them
Classify angles as acute, right, obtuse or straight
Geometric Terms
Picture
Angle –
Sides –
Vertex –
Notation
Congruent Angles –
Adjacent Angles -
Acute
Right
Obtuse
Straight
Less than 90°
90°
More than 90°
180°
Geometry
1.4 Notes
Example #1: Naming Angles
Name the angles in the figure:
A
1.
2.
C
B
3.
D
Refer to the diagram to answer the following questions. Given ABD  GBE .
D
C
A
Find the measure of the following angles.
95°
40°
B
45°
E
G
1.
ABF ________________
2.
ABG ________________
3.
ABD ________________
4.
GBE ________________
5.
CBE ________________
6.
FBE ________________
F
Geometry
1.4 Notes
9.
Is ABG  DBE and why?
10.
Name 4 acute angles.
11.
Name 4 obtuse angles.
12.
Name 2 straight angles.
13.
Name 2 adjacent angles.
13.
In the diagram, could the 95  angle be named  B ?