Sphere Surface Area

Write a Python function `surface_area_of_sphere(radius)` that calculates the surface area of a sphere given its radius. The formula for the surface area of a sphere is:

\[ A = 4 \pi r^2 \]

where:
- \( A \) is the surface area,
- \( r \) is the radius of the sphere,
- \( \pi \) is a mathematical constant approximately equal to 3.14159.

#### Example Usage
```python [main.nopy]
print(surface_area_of_sphere(10))  # Expected output: 1256.6370614359173
print(surface_area_of_sphere(15))  # Expected output: 2827.4333882308138
print(surface_area_of_sphere(20))  # Expected output: 5026.548245743669
```

import math

def surface_area_of_sphere(radius):
    """
    Calculate the surface area of a sphere given its radius.

    Args:
        radius (float): The radius of the sphere.

    Returns:
        float: The surface area of the sphere.
    """
    # Implement the formula for the surface area of a sphere
    pass

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Beginner math functions

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