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Math Help - Reference angle

  1. #1
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    Reference angle

    Hi, I need to.........

    find the reference angle for an angle of 220 degrees.
    --and-
    Fine the reference angle for an angle of 5pi / 3


    THANK YOU!
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  2. #2
    Site Founder MathGuru's Avatar
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    reference angle

    If you imagine the unit circle a reference angle is the smallest angle difference between the given angle and the x-axis (which is at 0 or 180 degrees).

    In the case of 220 it is closest to 180 so the reference angle is 40 degrees
    Attached Thumbnails Attached Thumbnails Reference angle-unitcircleref.png  
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