20 x 40 = 800 square feet !
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800 square feet (40 x 20 = 800).
40 Square Yards and Usually you want some overage so about 44 yards.
If it is 8 feet by 5 feet then there are 8*5 = 40 square feet
To find the total square footage of a room, you multiply the length by the width. In this case, a 35 x 40 room would have an area of 1,400 square feet. This calculation is derived from the formula for the area of a rectangle, which is length x width.
40 - (20%) = 32