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Need help understanding volumes of cones

  1. May 11, 2016 #1
    1. The problem statement, all variables and given/known data
    This was a example but I didn't quite understand it, I don't know how they ended up with 565.49 every time I try I get some random other number.
    upload_2016-5-11_17-11-21.png
    2. Relevant equations
    upload_2016-5-11_17-11-46.png

    3. The attempt at a solution
    So this is how i do it.

    upload_2016-5-11_17-13-52.png
    Pi (6) 2 (15)/3

    So first I multiply 3.14 (pi) by 6. so 3.14 x 6 = 18.84.
    Now 18.84 to the power of 2 is equal to 354.9456
    354.9456 x 15 = 5324.184
    5324.184 / 3 = 1774.728.

    I know im wrong but i just want to know how come when i try to calculate the volume it doesn't work???
     
  2. jcsd
  3. May 11, 2016 #2

    SammyS

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    You are squaring π as well as squaring r.

    Review ' Order of Operations '.
     
  4. May 11, 2016 #3
    ok i get it now, thx alot.
     
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