text: #include <iostream>
  #include <iomanip>
  #include <cmath>
  
  using namespace std;
   
  int main() {
      
      double A, B, C = 0;
      double pi = 3.14159;
      
      cin >> A >> B >> C;
      
      double areaTrian = (A * C)/2.0;
      
      double areaCirc = (pi * pow(C, 2));
  
      double areaTrap = ((A + B) * C)/2.0;
      
      double areaQuad = pow(B, 2);
      
      double areaRet = (A * B);
      
      cout << "TRIANGULO: " << fixed << setprecision(3) << areaTrian << endl;
      cout << "CIRCULO: "   << fixed << setprecision(3) << areaCirc  << endl;
      cout << "TRAPEZIO: "  << fixed << setprecision(3) << areaTrap  << endl;
      cout << "QUADRADO: "  << fixed << setprecision(3) << areaQuad  << endl;
      cout << "RETANGULO: " << fixed << setprecision(3) << areaRet   << endl;
  return 0;
  }
  