on a wall it would be 100 square feet.
A 6 foot by 3 foot area would be 18 square feet.
A 2x12x12 foot board would not be measured in square feet but cubic feet and there would be 240 feet3
That would be 5026.55 square feet.
16 foot x 16 foot deck would be 256 square feet.
Ummm, would you believe 1200 square feet?
300 square feet
225 square feet
48 square feet
340 square feet.
It would be a 20 by 20 ft square
Multiply width by length to get the area. The answer would be 1800 square feet.