include [HTML_REMOVED]
define PI 3.14159
int main()
{
double A, B, C;
scanf(“%lf %lf %lf”, &A, &B, &C);
printf(“TRIANGULO: %.3lf\n”, (1 / 2.0) * A * C);
printf(“CIRCULO: %.3lf\n”, PI * C * C);
printf(“TRAPEZIO: %.3lf\n”, (A + B) * C / 2.0);//梯形的面积=(a+b)/2h (上底+下底)高/2
printf(“QUADRADO: %.3lf\n”, B * B);
printf(“RETANGULO: %.3lf\n”, A * B);
return 0;
}