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Central angle of a cone?

  1. Aug 12, 2010 #1
    Hi,

    If you have a cone (right angle) with radius r, slant lenght l, how is the central angle theta = 2*pi*r/l?

    Thanks,

    Ivan77
     
  2. jcsd
  3. Aug 12, 2010 #2
    Realized the problem. It boils down to the formula for a arclength s = theta*radius (circle) where s is 2*pi*r (r is the radius of the cone) and the l is the radius of the circle.
     
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