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1714：RedField

题目描述
As the graph you see below, we named the red part "RedField".The read part is the intersection of an ellipse and a triangle.Now, 8600's not good at math, so he wants you to help him calculate the area of the "RedField".
输入解释
The first line of input contains n, the number of test cases. n lines follow.Each test case contains four numbers a, b, x, y(0 < b <= a <= x),and a is the lenth of OA, b is the lenth of OB,and x, y representing the coordinate of the point P.
输出解释
For each test case, output the area of the "RedField",accurate up to 2 decimal places.
输入样例 
1
1.00 1.00 2.00 2.00
输出样例 
0.39
来自杭电HDUOJ的附加信息
Recommend lcy
该题目是Virtual Judge题目，来自 杭电HDUOJ
题目来源 HDU 2007-Spring Programming Contest
源链接： HDU-1714
最后修改于 2020-10-25T22:47:28+00:00 由爬虫自动更新
共提交 0 次
通过率 --%
时间上限 内存上限
1000/1000MS(Java/Others) 32768/32768K(Java/Others)