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Math Help - Trig: find reference angle

  1. #1
    Newbie
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    May 2008
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    Trig: find reference angle

    Find reference angle of each angle.

    1) -240 degrees

    My answer: 30 degrees

    Is this correct?
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  2. #2
    Junior Member
    Joined
    Nov 2008
    Posts
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    Trig: find reference angle

    I believe that a -240 degree angle equates to a +120 degree angle (since they have to sum to 360 degrees). In that case, the acute angle between the terminal side of the +120 degree angle and the X axis would be a 60 degree angle (180 degrees - 120 degrees).

    - Steve J
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