#include<stdio.h> #include<math.h> int main() { double x1,x2,y1,y2; double r; while(scanf("%lf %lf %lf %lf %lf",&x1,&y1,&x2,&y2,&r)!=EOF) { double x=x1-x2; double y=y1-y2; double l=sqrt(x*x+y*y); if(x1==x2&&y1==y2) { printf("重合\n"); } else { if(l>2*r) { printf("相离\n"); } else if(l==2*r) { printf("相切\n"); } else { double ang1=acos((r*r+l*l-r*r)/2/l/r); double ang2=acos((r*r+l*l-r*r)/(2*l*r)); double area=ang1*r*r*2-sin(ang1)*r*l; printf("相交 %.2lf\n",area); } } } } |
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