hdu5954 Do not pour out

Posted 2020-10-09 不积跬步无以至千里，不积小流无以成江海

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? 

InputThe first line is the number of test cases. For each test case, a line contains a float-point number d.OutputFor 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

参考博客http://blog.csdn.net/danliwoo/article/details/53002695