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
How many acres are in a section of land? In the United States and Canada, a section in land measure is 1  square mile, equal to 640 acres, or about 259  hectares or 2.59 square kilometers in Metric measures.   â¦  See related link.ith 268,820 square miles of area and 640 acres per square mile the actual acerage is 172,044,800 acres.