Term
Standard position of an angle
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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 |
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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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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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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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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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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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