Question #1: Because it would not be a circle if it were not 360 degrees! (: Just kidding, it is because the Babylonians decided that a circle should contain 360 degrees. Question#2: Major railroads are 4 feet, 8 1/2 inches because the standard width of wagon wheels, trails, and roman chariots are 4 feet, 8 1/2 inches. Question #3: RENDEROSITY, that's who! (: Genny