#include <stdio.h>#include <math.h>int main(){?double a, b, c, s, Area;?scanf("%lf%lf%lf ", &a, &b, &c);?s =( a + b + c) / 2;?Area = sqrt(s*(s - a)*(s - b)*(s - c));?printf("三角形的面積是%f", Area);?return 0;}