Cement, or Portland cement, is a dry powder made. from limestone and other materials. It is burned in a. kiln and then finely ground. Cement reacts chemically. with water to cause concrete to harden.
There are 43,560 square feet in a acre; this is 4,840 square yards. You can find a conversion calculator at http://www.unitconversion.org/area/acres-to-square-foots-conversion.html Originally, the size of an acre was approximately the amount of land an ox could plow in a day.here are 43,560 square feet in a acre; this is 4,840 square yards. You can find a conversion calculator at http://www.unitconversion.org/area/acres-to-square-foots-conversion.html Originally, the size of an acre was approximately the amount of land an ox could plow in a day.
Acres to square feet (ac to ft2) area units conversion factor is 43560. To find out how many square feet in an acre, multiply by the conversion factor or use the converter. 1 Acre = 43 560 Square Feet There are 43560 square feet in an acre, because an acre is defined as an area of 1 chain by 1 furlong (66 feet * 660 feet), that makes 66 ft * 660 ft = 43560 sq. feet in an acre.