The area doesn't tell you the dimensions. There are an infinite number of different answers, all with the same area but different dimensions.
Here are a few:
1 ft by 864 ft
2 ft by 432 ft
3 ft by 288 ft
4 ft by 216 ft
8 ft by 108 ft
16 ft by 54 ft
24 ft by 36 ft
27 ft by 32 ft.
The area of each of these is 864 square feet.
Step-by-step explanation:

Square both sides of the equation.


Both 24 and 25 are rational. They can be turned into a fraction by putting a 1 as the denominator.
The answer is 1:11. After it being simplified from 6:66. Hope this helps.