Respuesta :
Answer:
The area of the garden is 9 km²
Step-by-step explanation:
If the garden is a square, that means that it's side length is one fourth of the total perimeter, giving us a length and width of 3km
That means that it's area is 3km × 3km, or 9km²
144 km because all sides of a square are equal and length times breadth is the area