Area of a circle = pi*radius squared
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1983 sq ft = 1983*12*12 = 285,552 sq in.
12*12 = 144
1728 sq. in. 1 foot = 12 inches 1 sq. ft. = 12 in. x 12 in = 144 sq. in. 144 sq. in./ sq. ft. x 12 sq. ft. = 1728 sq.in.
12' * 21 ft = 12*21 sq ft = 252 sq ft.
144 sq feet