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Problem with Vibration and Waves AP French?

  1. May 21, 2015 #1
    Hi All,

    Kindly see the attached Pictures.
    Vectors.PNG Equation.PNG

    I think COB is not 90 - δ/2
    But
    COB is 90-δ

    Can someone confirm.

    Thanks.
     
  2. jcsd
  3. May 21, 2015 #2
    No. It is over 2.
    Why do you think is not so?
     
  4. May 21, 2015 #3
    ∠'CBO' = 90 and ∠'OCB' = δ
    ∴ from the Δ 'OCB' we find that :
    ∠'COB' = 180-90-δ = 90-δ
     
  5. May 21, 2015 #4
    Why do you think CBO is 90? These triangles seem to be isosceles and not right-angle. Aren't these triangles all equal?
    Otherwise how do you know that the angle at OCB is delta?
     
  6. May 21, 2015 #5
    Ya, you r right, i got it -_- .
    My mind played tricks on me, i had the wrong mental image of an inscribed polygon in a circle, haven't done geometry in sometime.

    Thanks
     
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