#include <iostream>
#include <cstdio>
#define PI 3.14159

using namespace std;
int main()
{
    double a, b, c;
    double s1, s2, s3,s4, s5;
    cin >> a >> b >> c;
    s1 = a * c / 2.0;
    s2 = PI * c * c;
    s3 = (a + b) * c / 2;
    s4 = b * b;
    s5 = a * b;
    printf("TRIANGULO: %.3lf\n",s1);
    printf("CIRCULO: %.3lf\n",s2);
    printf("TRAPEZIO: %.3lf\n",s3);
    printf("QUADRADO: %.3lf\n",s4);
    printf("RETANGULO: %.3lf\n",s5);

    return 0;
}