To find the perimeter of the square, we use the formula for the perimeter of a square:

$\text{Perimeter} = 4 \times \text{side length}$

Given that the side length of the square is $7.5$ meters:

$\text{Perimeter} = 4 \times 7.5 = 30 \text{ meters}$

Thus, the correct answer is 30 meters.

Do you need further details or have any other questions?

Here are five related questions to expand on this concept:

1. What is the formula for the area of a square, and how does it differ from the perimeter formula?
2. How would the perimeter change if the side length was doubled?
3. What is the perimeter of a square with side length 12 meters?
4. How would you find the perimeter of a rectangle with different side lengths?
5. What would be the side length if the perimeter of the square was 40 meters?

Tip: Always remember to use the correct units in your final answer! For perimeter, the unit is in meters or the same unit as the side length given.