133.33 cubic yards, that's 400 feet
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An area 20ft x 34' is 680 square feet. 4 inches is 1/3 of a foot so cubic feet required is 680 x 1/3 = 226.7 cubic feet. There are 3x3x3 = 27 cubic ft in a cubic yard. Therefore cubic yards required = 226.7/27 = 8.4 cubic yards
1.7572 cubic yards
This area requires 2.5 cubic yards.
For this area you will need 2.4 cubic yards.
At 4" deep, a 13' x 19' area needs at least 3.05 cubic yards of cement.