#include <stdio.h>
 
int main() {
    double a, b, c, pi = 3.14159, area_triangle = 0, area_circle = 0, area_trapezio = 0, area_square = 0, area_rectangle = 0;
    
    scanf("%lf",&a);
    scanf("%lf",&b);
    scanf("%lf",&c);
    
    area_triangle = a * c / 2.0;
    printf("TRIANGULO: %.3lf\n",area_triangle);
    
    area_circle = pi * c * c;
    printf("CIRCULO: %.3lf\n",area_circle);
    
    area_trapezio = (a + b) * c / 2.0;
    printf("TRAPEZIO: %.3lf\n",area_trapezio);
    
    area_square = b * b;
    printf("QUADRADO: %.3lf\n",area_square);
    
    area_rectangle = a * b;
    printf("RETANGULO: %.3lf",area_rectangle);
    
    return 0;
}