The floor is (8 x 12) = 96 square feet
The ceiling is also . . . 96 square feet
Two walls are (8 x 8) = 64 square feet each
The other two walls are (8 x 12) = 96 square feet each
The total inside surface area is (2) x (96 + 64 + 96) = 512 square feet
(including the area of the door, hatch, etc.)
Assuming the 12ft is the diameter of the circle. The formula is A = pi x r2 Pi = 3.14 for general use. Therefore, (6 x 6) x 3.14 = 113.04ft2
12ft x 15ft = 180ft2
2*(length + width) = 54 feet.
32ft x 12ft = 384 square feet which converts to 35.6748 square meters.
Ah, what a happy little question! To convert feet to square meters, you first multiply the two dimensions (12ft x 9ft) to get the total square footage. Then, you can convert square feet to square meters by multiplying by 0.0929. So, 12ft x 9ft is 108 square feet, which is approximately 10.03 square meters. Just a few simple brushstrokes, and you've created a lovely conversion!
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.
12 x 12 feet, 4 inches deep: 1.8 cubic yards, minimum.
This cylinder will require 1.4 cubic yards of concrete (this assumes a length of 12' and a width of 2').
144 square feet.
15ft
864 ft
12 x pi (3.14) = 37.68ft2
80 x 80 x 12
12 * 9 = 108 square feet = 12 square yards
Area = 12ft * 12 ft = 144 square feet.
6 x (12 x 12) = 864 sq. feet
.... a statue that's 12ft tall.... What ever is 12ft tall