The question, as stated, cannot be answered sensibly. A square foot is a measure of area, with dimensions [L2]. A foot is a measure of distance, with dimensions [L]. The two measure different things and elementary dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
8 feet by 5.25 feet = 42 square feet
There are: 8 times 18 = 144 square feet
10.8 x 8 = 86.4 square feet.
If it is 8 feet by 5 feet then there are 8*5 = 40 square feet
Total square yards: 7.11
8 feet square is the same as 8 square feet. NOT!8 foot square is 8' x 8' or 64 square feet.
8
8 feet X 8 feet = 64 square feet
8 feet by 5.25 feet = 42 square feet
There are: 8 times 18 = 144 square feet
8 * 9 = 72Seventy two square feet
8 square feet = ~0.7 (0.74322432) square meters.
8 square feet
80 feet x 8 feet = 640 square feet.
8 x 10 = 80 square feet.
As 8 feet x 8 feet = 64 square feet it will only take one 8 feet by 8 feet tile to cover 64 square feet.
Multiply the two dimensions to get the area. In this case it would be 64 square feet.