#include<stdio.h> #include<math.h> #define pi 3.1415926 int main(){ int a,b,c; scanf("%d %d %d",&a,&b,&c); float circumference = a+b+c; float d = circumference/2.0; float area = sqrt(d*(d-a)*(d-b)*(d-c)); printf("circumference=%.2f area=...