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## Ignore words

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standard position

- an angle is in standard postion if its vertex is located at the origin and one ray is on the positive x-axis.

initial side

- the ray on the x-axis of an angle in standard position.

terminal side

- the ray that is not on the axis of an angle in standard position.

Quadrantal angle

- if the terminal side of an angle lies on the axis (like a 90 or 180 degree angle).

How is angle measured?

It is measured by the amount of rotation from the initial side to the terminal side.

Counterclockwise angle measurement

the measurement is positive

clockwise angle measurement

the measurement is negative

coterminal angles

two angles that have the same terminal side.

reference angle

an acute angle formed by the terminal side of the given angle and the x-axis.