Find the mathematical equation for the perimeter of the square with sides of length a.
The mathematical equation for the perimeter of a square with sides of length 'a' is given as: 

Perimeter = 4a.
Complete the following task based on the instruction and optional input provided.### Instruction:
Find the mathematical equation for the perimeter of the square with sides of length a.

### Output:
The mathematical equation for the perimeter of a square with sides of length 'a' is given as: 

Perimeter = 4a.