The answer depends on measurement units used for 14 x 40. 14 inches x 40 inches, 14 miles x 40 miles or whatever.
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You need to multiply the two numbers to get the square footage. In this problem the results will be 560 square feet.
800 square feet (40 x 20 = 800).
320 square feet (8 x 40 = 320)
14' x 9' = 126 square feet.
280 square feet.
There are: 23*14 = 322 square feet