#include <stdio.h> #include<math.h> int main() { double a,b,c; scanf("%lf %lf %lf",&a,&b,&c); double C=0,S=0; C=a+b+c; double p=C/2; S=sqrt(p*(p-a)(p-b)(p-c)); printf("circumference=%.2lf area=%.2lf",C,S); return 0; }