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.
There are: 12/3 = 4 yards
27 cubic yards.will cover 720 square feet @ 1 foot thick
There are 4 yards in 12 feet
You will need 0.56 cubic yards of concrete.
You will need 17.8 cubic yards of concrete.
This cylinder will require 1.4 cubic yards of concrete (this assumes a length of 12' and a width of 2').
144
Thickness? Do you mean cement or concrete - cement is the binder/adhesive in the concrete.
It is: 4 times 4 = 16 square yards
If you pour to a standard 4-inch thickness you will need 5.6 cubic yards.
If you use a standard 4-inch thickness you will need a minimum of 6.17 cubic yards.
4
There are: 12/3 = 4 yards
3 cu.yds
27 cubic yards.will cover 720 square feet @ 1 foot thick
There are 4 yards in 12 feet
how many square yards of carpet will they need for a dining room9ft and 12ft, a hall 3ft and 6ft, a living room 12f and 15ft