Photorefractive keratectomy. Photorefractive keratectomy (PRK) and laser-assisted sub-epithelial keratectomy (or laser epithelial keratomileusis) (LASEK) are laser eye surgery procedures intended to correct a person's vision, reducing dependency on glasses or contact lenses.
One acre is 43,660 square feet so 10 acres is 435,600 square feet. The area of a square is L 2 where L is the length of a side, so if the shape really is a square . L 2 = 435,600 square feet. so. L = Sqrt(435,600) = 660 feet. Penny
Hi Emily, A mile is a unit of length and a square foot measure of area so there is no way to convert one to the other. Length and area are different concepts. There are 43,560 square feet in an acre and therefore there are 72.5 43,560 square feet in 72.5 acres. My dictionary says that hence means therefore or for this reason.