习题专题2-习题1 计算三角形面积

//考点一:两点间距离公式
//考点二:海伦公式
#include
#include
int main()
{
	double a1, a2, b1, b2, c1, c2;
	double x1 = 0;
	double x2 = 0;
	double y1 = 0;
	double y2 = 0;
	double x3 = 0;
	double y3 = 0;
	scanf("%lf %lf %lf %lf %lf %lf", &x1, &y1, &x2, &y2, &x3, &y3);

	doubl服务器托管网e a = sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));

	double b = sqrt((x2-x3)*(x2-x3)+(y2-y3)*(y2-y3));
	
	double c = sqrt((x1-x3)*(x1-x3)+(y1-y3)*(y1-y3));
	double p = 0;
	double s = 0;
	p = (a + b + c) / 2;
	s = sqrt(p * (p - a) * (p - b) * (p - c))服务器托管网;
	printf("%.2lf",s );

	return 0;

}