reference angles
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reference angle
= positive acute angle made by the terminal side of an angle and the x-axis
For an angle in quadrant ___, the angle is the reference angle.
quadrant 1
reference angle formula for quadrant II?
θ' = 180° - θ
reference angle formula for quadrant IV?
θ' = 360° - θ
reference angle formula for quadrant III?
θ' = θ - 180°