------
## 最终结论
```python
import math

def volume_cone(r, h):
    return (1/3) * math.pi * (r ** 2) * h

# Test cases
assert volume_cone(5,12) == 314.15926535897927
assert volume_cone(10,15) == 1570.7963267948965
assert volume_cone(19,17) == 6426.651371693521
```