Answer:

Explanation:
The perimeter is the sum of all the side lengths and a square has 4 equal sides.
The perimeter of a square can be found by adding the side length 4 times or multiplying the side length by 4.

The side length is 9 centimeters.

Substitute the value into the formula.

Multiply

The perimeter of a square with a side length of 9 centimeter is 36 centimeters.