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Black Hole/ Schwarzschild

  1. Feb 11, 2015 #1
    Hello :)
    I had a question , i recently red a lot about black holes and i had a question about the Schwarzschild
    Radius . How does that come that π is not in the equation ? The black hole is a sphere so instinctly one could think that Pi should be in the equations.. ?
    P.S: I'm french and 16 so sorry for the eventuals faults :)
     
  2. jcsd
  3. Feb 11, 2015 #2

    mathman

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    In geometry, you start with radius r. π comes in to get circumference, area, volume, etc.
     
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