Co-terminal and Reference Angles

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What is the definition of a co-terminal angle?

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Co-terminal angles are angles that share the same terminal side when drawn in standard position. They can be found by adding or subtracting multiples of 360° (or 2π radians).

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How do you convert degrees to radians?

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Front

What is the reference angle?

Back

The reference angle is the acute angle formed by the terminal side of an angle and the x-axis. It is always positive and less than 90°.

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How do you find the reference angle for an angle in the second quadrant?

Back

For an angle in the second quadrant, the reference angle is found by subtracting the angle from 180°. For example, for 120°, the reference angle is 180° - 120° = 60°.

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Front

How do you convert radians to degrees?

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