1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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


    User Avatar
    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.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook