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A 21 foot boat refers to the length of the boat. There is not comparison between length and width. It could be narrow as on narrow boats or wide as in sea faring boats,
21-ft x 22-ft = 462 ft2
45 ft wide
12' * 21 ft = 12*21 sq ft = 252 sq ft.
The area is 21*31 = 651 square feet.