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Write a Python function `volume_cylinder` that calculates the volume of a cylinder given its radius and height. The formula for the volume of a cylinder is:
\[ V = \pi \times r^2 \times h \]
Where:
- \( r \) is the radius of the cylinder's base.
- \( h \) is the height of the cylinder.
- \( \pi \) is approximately 3.1415.
#### Function Signature
```python [main.nopy]
def volume_cylinder(radius: float, height: float) -> float:
pass
```
#### Example Usage
```python [main.nopy]
print(volume_cylinder(10, 5)) # Expected output: 1570.75
print(volume_cylinder(4, 5)) # Expected output: 251.32
print(volume_cylinder(4, 10)) # Expected output: 502.64
```
#### Constraints
- The radius and height will always be positive numbers.def volume_cylinder(radius: float, height: float) -> float:
"""
Calculate the volume of a cylinder given its radius and height.
Args:
radius (float): The radius of the cylinder's base.
height (float): The height of the cylinder.
Returns:
float: The volume of the cylinder.
"""
# Placeholder for the solution
pass