2016沈阳区域赛http://acm.hdu.edu.cn/showproblem.php?pid=5954

Do not pour out

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)
Total Submission(s): 1660    Accepted Submission(s): 326

Problem Description
You have got a cylindrical cup. Its bottom diameter is 2 units and its height is 2 units as well.
The height of liquid level in the cup is d (0 ≤ d ≤ 2). When you incline the cup to the maximal angle such that the liquid inside has not been poured out, what is the area of the surface of the liquid? 
 
Input
The first line is the number of test cases. For each test case, a line contains a float-point number d.
 
Output
For each test case, output a line containing the area of the surface rounded to 5 decimal places.
 
Sample Input
4
0
1
2
0.424413182
 
Sample Output
0.00000
4.44288
3.14159
3.51241
 
Source
 
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jiangzijing2015
 

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