How big is 20000 squar feet in length and weith?

Answer 1

There is no such thing as squar feet nor is there anything such as weith.

The area of 20000 square feet is not enough to determine the dimensions. First of all, the area need not be rectangular: it could be a circular or triangular or even some irregular shape. Even if you assume it is rectangular, there is not enough information to determine its dimensions.

Let L ≥ sqrt(20000) = 141.42 feet be the length of a rectangle

and let W = 20000/L be its width.

Then L*W = L*20000/L = 20000

and the choice of L ensures that each pair (L,W) is distinct.

Since the choice of length was arbitrary, there are infinitely many possible answers to the question.