计算简单多边形内，放置一个圆，其最大半径的大小。其中涉及到二分半径，已知半径的情况下两点确定一个圆，一点一边确定一个圆，两边确定一个圆-Calculated within the simple polygon, place a circle, the maximum size of the radius. Half of which related to the radius, known case of two points to determine the radius of a circle, a little while to determine a circle, a circle on both sides to determine