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
400 square feet
20 x 20 = 400 square feet.
800 square feet (40 x 20 = 800).
2.78 square feet.
20' x 60' = 1,200 square feet.
13 x 20 = 260 square feet (13 and 20 must be in feet)
20 x 19 = 380 square feet.
12 x 20 = 240 square feet.
13 x 20 = 260 square feet.
400 square feet.
400 square feet (20 x 20 = 400)
20' x 30' = 600 square feet.