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Geometry SAT problem

  1. Sep 19, 2013 #1
    1. The problem statement, all variables and given/known data
    A right circular cone is drawn above, with 2 circles centered at A on its base as shown. AB is the height of the cone, the measure of <ABC is 60° and BC has a lenght of y. If BD bisects <ABC, which one of the following gives the area of the smaller circle in terms of y?

    http://imgur.com/JgrevjM

    2. Relevant equations

    none

    3. The attempt at a solution
    Included in the picture

    Could you explain what I did wrong, and how to get the correct answer? Thanks
     
  2. jcsd
  3. Sep 19, 2013 #2
    BD doesn't bisect AC.
     
  4. Sep 19, 2013 #3
    Doesn't bisecting cause the bisecting thing to bisect the line segment from where the angles end?
     
  5. Sep 19, 2013 #4

    Office_Shredder

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    Staff Emeritus
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    Gold Member

    It bisects the angle ABC, it does not cut the line AC in half (which seems to be what you are using)
     
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