//12.2
#include <iostream>
#include <cmath>

using namespace std;
double s(double a,double b,double c){
    double p;
    p=(a+b+c)/2.0;
    return (sqrt(p*(p-a)*(p-b)*(p-c)));
}
double s(double r){
    return (r*r*M_PI);
}

int main()
{
    double a,b,c,r;
    cin>> a>>b>>c>>r;
    cout <<s(a,b,c)<<"\t"<<s(r);
    return 0;
}