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Finding the angle from sin(2 theta)=0.348

  1. Mar 20, 2013 #1
    I was wonder how to find the second angle to this problem. I already know one of the angle is 10.2 degree but shouldn't the the second angle be 180-(2*10.2) since in the second quadrant, sin values are positive but in the book, it's given as 90-10.2. Is it something to do with the properties of (2 theta)?
     
    Last edited: Mar 20, 2013
  2. jcsd
  3. Mar 20, 2013 #2

    vela

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    Let x=2θ. Then you have sin x = 0.348, so x=20.4 or x=180-20.4. Now write x in terms of θ and solve.
     
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