1012.cpp

#include <iostream>
#include <stdio.h>

using namespace std;

int main(){
    float a,b,c;
    float pi = 3.14159;
    
    cin >> a;
    cin >> b;
    cin >> c;
    
    printf("TRIANGULO: %.3f\n", (a*c)/2);
    printf("CIRCULO: %.3f\n", pi*c*c);
    printf("TRAPEZIO: %.3f\n", ((a+b)*c)/2);
    printf("QUADRADO: %.3f\n", b*b);
    printf("RETANGULO: %.3f\n", a*b);
    
    return 0;
}