My son could not figure out his homework today. He needed to know the circumfurence of a circle around a hexagon. (We were given the length of one of the hexagon sides.) This http://www.khanacademy.org/math/geometry/basic-geometry/circum_area_circles/v/circles–radius–diameter-and-circumference totally helped us.

Thank you, Mr. Khan!!!!!!! ((heart heart))