#include <stdio.h>
#include <math.h>
 
int main() {
 
    const double pi = 3.14159; //Contant value of pi
    double A, B, C;
 
    scanf("%lf%lf%lf", &A, &B, &C);
 
    double Area_Triangle = 0.5*A*C;
    // area of triangle
    double Area_Circle = pi*pow(C,2);
 
    double Area_Trapezium = 0.5*(A+B)*C;
 
    double Area_Square = pow(B,2);
 
    double Area_Rectangle = A*B;
 
 
    printf("TRIANGULO: %.3lf\n", Area_Triangle);
    printf("CIRCULO: %.3lf\n", Area_Circle);
    printf("TRAPEZIO: %.3lf\n", Area_Trapezium);
    printf("QUADRADO: %.3lf\n", Area_Square);
    printf("RETANGULO: %.3lf\n", Area_Rectangle);
 
	return 0;
}
 

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12.7 10.4 15.2