Consider the given shape.

Notice that the given shape is a square.

We know,

Perimeter of a square = 4 × side

Side of the given square = 12 centimeters​

 Perimeter of the square = 4 × 12                              

                                        = 48

As the lengths are measured in centimeters, the perimeter is also measured in centimeters.

So, the perimeter of the given square is 48 centimeters​.