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# Copy of Angles Definitions

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## Carol Weltzien

on 15 September 2017

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#### Transcript of Copy of Angles Definitions

Angle Definitions
formed by two rays that share a
common endpoint.
Angle:
C
A
B
common endpoint of the two rays
Vertex of an Angle:
C
B
A
Point C is the vertex
Two rays
Sides:
C
B
A
CA and CB are sides.
smallest amount of rotations
about the vertex from one ray to another measured in degrees

Measure of an Angle:
unit of measure for angles
Degree:
geometry tool you use
to measure an angle
Protractor:
A ray that contains a vertex
and divides the angle into
two congruent angles
Angle Bisector:
C
B
A
angles that have the
same measure
Congruent Angles:
C
B
A
Z
X
Y
an example that shows a
definition or conjecture is
incorrect or incomplete
Counterexample:
noncoplanar lines
Skew Lines:
an angle that is 90°
Right Angle:
an angle that is less than 90°
Acute Angle:
60°
an angle that is more than 90°
Obtuse Angle:
120°
Two lines that intersect at a 90° angle
Perpendicular Lines:
90°
Two coplanar angles that share
a common vertex and side
and no other points
1
2
Two angles that add up to 90°
Complementary Angles:
Two angles that add up to 180°
Supplementary Angles:
angles formed by
intersecting lines
Vertical Angles:
1
2
Linear Pair:
that are formed by
a line and ray
intersecting

1. point on ray-vertex- point on another ray
Three Ways to Name an Angle:
2. Vertex
S
A
M
SAM
3. By a number
A
1
1
)
)
70
110
o
o
Full transcript