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Area of the Wafer

  1. Mar 13, 2010 #1
    Hello guys, I have an upcoming test. When I was doing a question about finding the area of the wafer. it is circular. In the solution manual it says pi*r^2 / 4 . I do not understand where 1/4 comes from. Since it is circular , I assumed the pi*r^2 would be fine.
     
  2. jcsd
  3. Mar 13, 2010 #2

    dlgoff

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    Usable area? I could see a little waste but not that much.
     
  4. Mar 13, 2010 #3
    it just says compare the areas of wafers for the gven diameters .
     
  5. Mar 13, 2010 #4
    nevermind i just found d=2r ;lol sorry
     
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