800 square feet (40 x 20 = 800).
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20 x 40 = 800 square feet !
40 square feet.
35x40 feet is equal to 1400 square feet.
40 square feet. Multiply the two dimensions - the result is the number of square feet.
If it is 8 feet by 5 feet then there are 8*5 = 40 square feet