Final answer:
To find the perimeter of a shape in geometry, you need to add up the lengths of all the sides.
Step-by-step explanation:
To find the perimeter of any shape in geometry, you need to add up the lengths of all the sides. In the case of a square, the perimeter is equal to 4 times the length of one side. For example, if the side length of the square is 'a', the perimeter would be 4a.