#include<stdio.h> #include<math.h> int main() { float a, b, c; scanf("%f %f %f", &a, &b, &c); float p; p = (a + b + c) / 2; //计算半周长 float area; area = sqrt(p * (p - a) * (p - b) * (p - c)); //计算面积 printf("circumference=%.2f area=%.2f", p * 2, area); return...