Respuesta :
Perimeter = 2* length + 2 * width
12 feet = 2* 3 feet + 2 * width
2 * width =12 feet -2* 3 feet
2 * width =6 feet
width = 3feet
12 feet = 2* 3 feet + 2 * width
2 * width =12 feet -2* 3 feet
2 * width =6 feet
width = 3feet
The other side of it is 3 feet because 3+3+3+3 is 12