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Intro to Trig

  1. Sep 6, 2008 #1
    1. The problem statement, all variables and given/known data

    Determine the quadrant in which the terminal side of the angle lies. (The angle is given in radians.)

    a) -1 b) -2

    3. The attempt at a solution

    a) -1 * (180/3.14) = -57.3 degrees -- Quadrant IV

    b) -2 * (180/3.14) = -114.6 degrees -- Quadrant III

    - Is there a way to find out which quadrant they're in without having to to convert them into degrees?
    Last edited: Sep 6, 2008
  2. jcsd
  3. Sep 6, 2008 #2


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    Science Advisor

    Well, how does knowing them in degrees help you? I assume it is because you know that 0, 90, 180, and 270 degrees, as well as -90, -180, and -270 are the "separators". You should know the same thing for radians. The corresponding values are 0, [itex]\pi/2[/itex]= 0.785, [itex]\pi/2[/itex]= 1.57, [itex]3\pi/2[/itex]= 4.71, and the corresponding negative values.
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