The figure shows the plan of the St. Mary Chapel and the scheme of geometry which develops from it. The width of the chapel, 39.6 feet, means that the side of the outer square is 79.2 feet in length, and the area contained by that square is equal to one ten-thousandth part of 1440 acres. There are 120 acres in one hide of land, so 1440 acres is the area of the twelve hides of Glastonbury. In this diagram the twelve hides are represented on a scale of 1:10,000. http://freethoughtnation.com/forums/viewtopic.php?t=2676