#include<stdio.h> #include<math.h> int main(){ double x1,y1,x2,y2,r; double d,c,s; while(scanf("%lf %lf %lf %lf %lf",&x1,&y1,&x2,&y2,&r)!=EOF){ d=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)); if(d==2*r) printf("相切\n"); else if(d>2*r) printf("相离\n"); else if(d==0) printf("重合\n"); else{ printf("相交 "); c=acos(d/2.0/r); //公式 s=c*r*r-d/2.0*r*sin(c); printf("%.2lf\n",2*s); } } return 0; } |
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