vocabulary section 1 4
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Vocabulary Section 1-4
1
Angle, Side, Vertex
An Angle is formed by two rays with the same endpoint.
The rays are the sides of the angle (ex. BA and BC)
The endpoint is the vertex of the angle (ex. B)
1
Naming an Angle:
You can name an angle by: The vertex B A Number 1 A point on each ray and the vertex,
ABC or CBA ▪ When naming an angle by three points the vertex must go in the middle.
Postulate 1-7: Protractor Postulate
Angle Measure
Congruent Angles
Types of AnglesLess than 90
degreesExactly 90
degrees More than 90 degrees
Exactly 180 degrees
Postulate 1-8: Angle Addition Postulate
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