A square foot is a unit of area. A foot is a unit of distance. The two units are therefore incompatible.
There are: 126/12 = 10.5 feet
126 feet square
16-ft x 70-ft = 1,120 square feet
100 feet x 100 feet = 10,000 square feet.
30 feet x 30 feet = 900 square feet.
126 square feet. Just multiply length by width - the answer is the square footage.
There are: 126/12 = 10.5 feet
126 feet square
180 square feet.
414 square feet
1000 square feet
Multiply the two dimensions to get the area. The calculation will give you 1,250 square feet.
600 square feet.
12x24=288 square feet.
2,400 square feet.
300 square feet
1344 square feet.