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Unit 11: circular functions
circular functions
6
Mathematics
9th Grade
04/09/2021

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Term

Standard position of an angle 

 

 

Definition

An angle is in standard position if its vertex is located at the origin, and its initial side extends along the positive x-axis

 

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Term
Positive and negative angles 
Definition

The measure of an angle describes the magnitude and direction of the rotation of the ray from its initial position to its terminal position. If the rotation is counterclockwise, the angle has a positive measure. If the rotation is clockwise, the angle has a negative measure.

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Term
Reference angles 
Definition

The reference angle is the positive acute angle that can represent an angle of any measure. The reference angle must be <90∘

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Term
Coterminal angle 
Definition

Coterminal angles: are angles in standard position (angles with the initial side on the positive x-axis) that have a common terminal side. 

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Term
Vertex of an angle
Definition

The vertex of an angle is the point where two rays begin or meet, where two line segments join or meet

 

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Term
Quadrants 
Definition

The axes of a two-dimensional Cartesian system divide the plane into four infinite regions, called quadrants, each bounded by two half-axes. These are often numbered from 1st to 4th and denoted by Roman numerals

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