20 x20
* * * * *
And why not 10 ft x 40 ft?
And why do you assume it is square or rectangular?
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The area of the room is the result of multiplying the lengths of two walls. So if your room is 400 square feet, the walls might be 20 ft. by 20 ft., 10 ft. by 40 ft., or any other combination that would multiply out to be 400.
That room size can be estimated 15 ft x 40 ft
400 sq. miles = 27,878,400 sq. ft. x 100 = 2,787,840,000 sq. ft.
40
If the room is rectangular, just use the formula for the area of a rectangle. In other words, multiply length x width.