Length times width will give you area. So this comes out to 400 square feet.
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800 square feet (40 x 20 = 800).
If the numbers are in feet then 86 times 20 = 1720 square feet
20 X 16 = 320, 320 square feet
If the given dimensions are in feet then 24 times 20 = 480 square feet
= 20 sq feet