%求三個圓所相交部分的三個交點坐標所成三角形的重心坐標(barycenter_x,barycenter_y)
%三個圓(圓心為x1,y1半徑為r1。圓心為x2,y2半徑為r2。圓心為x3,y3半徑為r3)
function [barycenter_x,barycenter_y]=barycenter(x1,y1,r1,x2,y2,r2,x3,y3,r3)
    [fn1x,fn1y,fn2x,fn2y,fn3x,fn3y]=c3point(x1,y1,r1,x2,y2,r2,x3,y3,r3);
    barycenter_x=(fn1x+fn2x+fn3x)/3;
    barycenter_y=(fn1y+fn2y+fn3y)/3;