#include<bits/stdc++.h> using namespace std; int main(){ double x,y,z,w,r,l,a,b; while(cin>>x>>y>>z>>w>>r){ l=sqrt((z-x)*(z-x)+(w-y)*(w-y)); if(l==0)cout<<"重合"; else if(l==2*r)cout<<"相切"; else if(l>2*r)cout<<"相离"; else if(l<2*r){ a=acos(l/2/r)*2; b=r*r*a-r*r*sin(a); printf("相交 %.2lf",b); } cout<<endl; } return 0; } |
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