Find the volume of a cone whose radius and height are provided as parameters to the function `volume`. Use the value of PI provided by your language (for example: `Math.PI` in JS, `math.pi` in Python or `Math::PI` in Ruby) and round down the volume to an Interger.
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from math import pi
def volume(r,h):
    return int(pi*r*r*h/3)
from math import pi
def volume(r,h):
    return int(pi*r*r*h/3)