1. Feb 22, 2012 #1

   emc92

   

   i just need some help on how to start the process of proving it.
   suggestions/recommendations/anything will help!

    

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   emc92, Feb 22, 2012
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3. Feb 22, 2012 #2

   tiny-tim

   

   Science Advisor

   Homework Helper

   hi emc92!
   
   standard technique …
   
   thinly slice the surface into shapes that you already know the area of …
   
   

   in this case, horizontal slices of height dz will give you sloping rings ​

    

   tiny-tim, Feb 22, 2012

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