Question: 
Write a function to find the volume of a cone.


Model's Code:
def volume_cone(radius, height):
    import math
    return (1/3) * math.pi * (radius ** 2) * height



Sample Correct Code:
import math
def volume_cone(r,h):
  volume = (1.0/3) * math.pi * r * r * h
  return volume


Asserts:
assert volume_cone(5,12)==314.15926535897927
assert volume_cone(10,15)==1570.7963267948965
assert volume_cone(19,17)==6426.651371693521


Tests:
Test 1 of 3: PASS
Test 2 of 3: PASS
Test 3 of 3: FAIL: AssertionError()

Test 312 of 974: 224/312 (71.7948717948718%): failed