You can not equate the two units.
If the area of the square is 324 square inches then its perimeter is 4*18 = 72 inches
324 square inches converts to 2.25 square feet.
324 square inches
It depends what the 324 inches refers to. It cannot be the area since an area is measured in square inches, not inches. The question is unnecessary if the 324 inches refers to the length of the sides. If 324 inches is the perimeter, then the length of one side is 324/4 = 81 inches.
Area of square: 324 square inches Perimeter of square: 72 inches
Assuming it is a circle, it is about 63.8 inches, a square would be 72 inches.
A=Pi*r2 324=Pi*r2 r2=324/Pi r=√(324/Pi) r~=10.155 inches
The area is 324 square inches.
16 ins.
13.7548112 square metres
The area of square is : 5184.0
30 metres square = 900 square metres 6 inches = 0.1524 metres. So amount of soil required = 900*0.1524 = 137.16 cubic metres