hdu 1110几何题

应该说是道简单的几何题，可是我推公式还是推了半天，主要就是斜着放的情况吧，刚开始推的公式不对，wa了几次。

/*
 * hdu1110/win.cpp
 * Created on: 2012-10-24
 * Author    : ben
 */
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <ctime>
#include <iostream>
#include <algorithm>
#include <queue>
#include <set>
#include <map>
#include <stack>
#include <string>
#include <vector>
#include <deque>
#include <list>
#include <functional>
#include <numeric>
#include <cctype>
using namespace std;
typedef long long LL;

bool judge(double a, double b, double x, double y) {
    if(a * b <= x * y) {
        return false;
    }
    if(x < a && y < b) {
        return true;
    }
    if(b <= y) {
        return false;
    }
    double alpha = atan(x / y);
    double z = sqrt(x * x + y * y);
    double beta = acos(b / z);
    double temp = 2 * y * sin(alpha - beta) + sqrt(z * z - b * b);
    return temp < a;
}

int main() {
#ifndef ONLINE_JUDGE
    freopen("data.in", "r", stdin);
#endif
    int T, x, y, a, b;
    scanf("%d", &T);
    while(T--) {
        scanf("%d%d%d%d", &a, &b, &x, &y);
        if(a < b) {
            swap(a, b);
        }
        if(x < y) {
            swap(x, y);
        }
        if(judge(a, b, x, y)) {
            puts("Escape is possible.");
        }else {
             puts("Box cannot be dropped.");
        }
    }
    return 0;
}