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# Math Vocab

### 1.5 pages 37-46

TermDefinition
Angle (how to name it): Angle sign, and then the letter at the point where the 2 rays connect
Vertex of an angle: The common endpoint of 2 rays
Side of an angle (be careful in the labeling): The rays of an angle
Interior vs exterior of an angle: Interior is the inside of the angle/triangle. Exterior is the outside of the angle/triangle
Postulate 1.3 The Protractor Postulate: The measure of ∠AOB, which can be written as m∠ZAOB, is equal to the absolute value of the difference between the real numbers matched with OA and OB on a protractor.
Postulate 1.4 The Angle Addition Postulate: Words: If P is in the interior of∠RST, then the measure of ∠RST is equal to the sum of the measures of ∠RSP and ∠PST. Symbols: If P is in the interior of ∠RST,then, m∠RST = m∠RSP+m∠PST
Measure of an angle (degrees): The absolute value of the difference between the real numbers matched with the 2 rays that form the angle on a protractor
Construction - Bisecting an angle (use a ruler and compass): A geometric drawing that uses a limited set of tools, usually a compass and a straightedge
Types of angles: There are three types of angles, acute, obtuse, and right
Acute angle: An angle that has a measure greater than 0° and less than 90°
Obtuse angle: An angle that has a measure greater than 90° and less than 180°
Right angle: An angle that has a measure of 90°
Straight angle: An angle that has a measure of 180°
Congruent angles: 2 angles that have the same measure
Angle bisector: A ray that divides an angle into 2 angles that are congruent
Created by: Oliviab1.3

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