Term
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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
If an angle is generated by a counter-clockwise rotation, we call angle a positive angle. On the other hand, if an angle is generated by a clockwise rotation we call angle a negative angle.
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Term
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Definition
The reference angle is the angle that the given angle makes with the x-axis. Regardless of where the angle ends (that is, regardless of the location of the terminal side of the angle), the reference angle measures the closest distance of that terminal side to the x-axis.
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Term
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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. For example, the angles 30°, –330° and 390° are all coterminal
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Term
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Definition
The vertex of an angle is the point where two rays begin or meet
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