#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=%.2f",circumference,area); //求面积用的是海伦公式 return 0; }