Math

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How could you change the height of a cone so that its volume would remain the same when its radius was tripled?

  • Math -

    anything that has straight sides and a pointy top has volume = (1/3)(area of base)(altitude)
    old V = (1/3) h pi r^2
    new V =(1/3) H pi R^2
    if new V = old V
    then
    h r^2 = H R^2
    H = h (r/R)^2
    H/h = (1/3)^2
    H/h = 1/9

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