You multiply 12 x 12 x 0.5 = 72 cu ft
You did not specify the depth of your pool, however, with the information provided, it can be determined that your pool has a surface area of 12*24=288 square feet *144= 41,472 square inches. To find the number of cubic inches in your pool, multiply that number by the depth of your pool in inches. Remember, one foot is equal to 12 inches.
12 x 12 feet, 4 inches deep: 1.8 cubic yards, minimum.
1 cubic foot = 12 * 12 * 12 = 1728 cubic inches. > 2 * 8 * 1 = 16 cubic inches > 16 / 1728 = 0.00926 cubic feet.
213,000 gal / 7.48 gal /cubic foot =28,476cf /12ft(depth)=2373 sqft of surface area
144 inches
12ft 8in (142/12 = 12ft 152-144=8in)
If you mean 12 feet long by 8 inches wide by 4 inches deep, you will need at least 0.1 cubic yards
144 inches
12ft 3 inches
This needs more information to supply a "best" answer. A 12ft by 12ft patio gives a surface area of 16 sq.yds. A yard of concrete is a cubic yard. The number of cubic yards depends on the thickness of the slab, and the size and depth of foundations (if any). This depends on the type of soil and subsoil, and whether you have very cold winters. If you live in a warm area, 3 yards is probably about right. If you are planning to do this yourself, try asking your local building inspector for his advice.
480 inches
151 inches. 12x12 + 7.