cpp

#include<bits/stdc++.h>
using namespace std;
int main()
{
    double a,b,c;
    cin>>a>>b>>c;
    double tr = (0.5*(a*c));
    cout<<"TRIANGULO: "<<tr<<fixed<<setprecision(4)<<endl;
    double cir = (3.14159*c*c);
    cout<<"CIRCULO: "<<cir<<fixed<<setprecision(3)<<endl;
    double tra = (.5*(a+b)*c);
    cout<<"TRAPEZIO: "<<tra<<fixed<<setprecision(3)<<endl;
    double qua = (b*b);
    cout<<"QUADRADO: "<<qua<<fixed<<setprecision(3)<<endl;
    double ret = (a*b);
    cout<<"RETANGULO: "<<ret<<fixed<<setprecision(3)<<endl;
    return 0;
}