What is the dimensions of the area of 81 sq ft?

If the area is square than we just find the square root of 81,which is 9 feet x 9 feet.

Or if it is a Rectangle we could divide 81 by 18 to get 18 feet x 4.5 feet.

If the area is a circle we will multiply 81 by PI, then take the square root multiplied by two. In that case it would equal a circle 10.1 feet in diameter.

If the area was a triangle the dimensions could be 9 feet by 18 feet by 20.1 feet (altitude, base, hypotenuse).