ring = [[0,0],[-90,0],[-180,0],[90,0],[0,0]]area = 6.283185307179588ring = [[0,0],[90,0],[-180,0],[-90,0],[0,0]]area = 6.2831853071795845 ring = [[0,0],[-90,0],[-180,0],[90,0],[0,0]]area = 0ring = [[0,0],[90,0],[-180,0],[-90,0],[0,0]]area = 0