HDU 1411（校庆神秘建筑）

Intelligence1028

于 2020-04-01 12:40:00 发布

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文章标签： HDU

原文链接：https://blog.youkuaiyun.com/moringrain/article/details/48342361?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522158571303919724846444865%2522%252C%2522scm%2522%253A%252220140713.130056874..%2522%257D&request_id=158571303919724846444865&biz_id=0&utm_sour

版权

#include <iostream>
#include <iomanip>
using namespace std;

double angle(double a, double b, double c)
{
	double ans = (a * a + b * b - c * c) / (2.0 * a * b);
	return acos(ans);
}

int main()
{
	double a, b, c, d, e, f;
	while (cin >> a >> b >> c >> d >> e >> f)
	{
		double A, B, C, W, V;
		A = angle(a, b, d);
		B = angle(b, c, f);
		C = angle(a, c, e);
		W = (A + B + C) / 2.0;
		V = a * b * c * sqrt(sin(W) * sin(W - A) * sin(W - B) * sin(W - C));
		V /= 3.0;
		cout << fixed << setprecision(4) << V << endl;
	}
	return 0;
}