圆 C;
for(i=1 to n)
{if(P[i] 不在 C 内){C = {P[i], 0};for(j=1 to i-1){if(P[j] 不在 C 内){C = {0.5*(P[i]+P[j]), 0.5*dist(P[i], P[j])};for(k=1 to j-1){if(P[k] 不在 C 内){C = 外接圆(P[i], P[j], P[k]);}}}}}
}

#include<bits/stdc++.h>
#define il inline
#define reg register int
#define numb (ch^'0')
using namespace std;
typedef long long ll;
il void rd(int &x){char ch;bool fl=false;while(!isdigit(ch=getchar()))(ch=='-')&&(fl=true);for(x=numb;isdigit(ch=getchar());x=x*10+numb);(fl==true)&&(x=-x);
}
namespace Miracle{
const int N=100000+5;
int n;
struct po{double x,y;po(){x=0;y=0;}po(double xx,double yy){x=xx;y=yy;}po friend operator +(po a,po b){return po(a.x+b.x,a.y+b.y);}po friend operator /(po a,double c){return po(a.x/c,a.y/c);}po friend operator -(po a,po b){return po(a.x-b.x,a.y-b.y);}double friend operator *(po a,po b){return a.x*b.y-a.y*b.x;}double len(){return x*x+y*y;}
}p[N];
po rev(po a){swap(a.x,a.y);a.y=-a.y;return a;
}
po circle(const po &A,const po &B,const po &C){po lmd=(A+B)/2,rmd=(B+C)/2;po vel=rev(B-A),ver=rev(C-B);cout<<" mom "<<ver*vel<<endl;double t=ver*(rmd-lmd)/(ver*vel);vel.x*=t;vel.y*=t;return lmd+vel;
}
int main(){srand(20011023);int n;rd(n);for(reg i=1;i<=n;++i){scanf("%lf%lf",&p[i].x,&p[i].y);}random_shuffle(p+1,p+n+1);po o;double r=0.0;for(reg i=1;i<=n;++i){if((p[i]-o).len()>r){o=p[i];r=0;for(reg j=1;j<i;++j){if((p[j]-o).len()>r){o=(p[j]+p[i])/2;r=(p[j]-o).len();for(reg k=1;k<j;++k){if((p[k]-o).len()>r){o=circle(p[i],p[j],p[k]);r=(p[i]-o).len();}}}}}
//        cout<<" i "<<i<<" : "<<r<<" x "<<o.x<<" y "<<o.y<<endl;
    }printf("%.10lf\n%.10lf %.10lf",sqrt(r),o.x,o.y);return 0;
}}
signed main(){Miracle::main();return 0;
}/*Author: *Miracle*Date: 2019/4/30 20:32:29
*/