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Surface Area of Revolution

  1. Dec 21, 2009 #1
    I know that the surface area of a revolution is equal to the integral from a to b of 2pi times the radius time the arc length. But, why isn't it just the integral from a to b of the circumference?
     
  2. jcsd
  3. Dec 21, 2009 #2
    Nevermind, I found the answer in a previous post.
     
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