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