1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    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!

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?


    2. Relevant equations


    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


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    It bisects the angle ABC, it does not cut the line AC in half (which seems to be what you are using)
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted