Answer :
Well, you can put 200 into your calculator and find the square root which would be 14.1. Your sides are approximately 14.1 sq.ft long.
Area = length x width
Area of a Square = length²
Area = 200
200 = L²
√200 = √L²
L = √200
L = 14.142135623730950488016887242097
L = 14.1
Area of a Square = length²
Area = 200
200 = L²
√200 = √L²
L = √200
L = 14.142135623730950488016887242097
L = 14.1