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Find r

  1. Apr 18, 2008 #1
    1. The problem statement, all variables and given/known data

    Please help me find r

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Apr 18, 2008 #2


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    What do you think should be done first? (Hint: post this in precalculus mathematics Homework forum)
  4. Apr 18, 2008 #3


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    Draw some triangles and start solving them. Start by drawing the isosceles triangle created by the centers of the the three smaller circles, you can determine it's angles. It should be clear that the center of the big circle lies along the altitude of that triangle. Draw a smaller triangle including that center and use the information about the angles.
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