Question

三角形外接圆圆心坐标公式是什么?

Answer 1

平面坐标

A=sqrt((Xa-Xb)*(Xa-Xb)+(Ya-Yb)*(Ya-Yb))

B=sqrt((Xa-Xc)*(Xa-Xc)+(Ya-Yc)*(Ya-Yc))

C=sqrt((Xb-Xc)*(Xb-Xc)+(Yb-Yc)*(Yb-Yc))

y=(A+B+C)/2

x=sqrt(y*(y-A)*(y-B)*(y-C))

r=A*B*C/(4*x)