1566 -- Cup
Time Limit :1000 MS Memory Limit :65536 KB
Accepts : 21 Submits : 157
User Accepts : 19 User Submits : 21
<Submit>   <Statistics>   <Discuss>


The WHU ACM Team has a big cup, with which every member drinks water. Now, we know the volume of the water in the cup, can you tell us it height?
The radius of the cup's top and bottom circle is known, the cup's height is also known.


The input consists of several test cases. The first line of input contains an integer T, indicating the num of test cases.
Each test case is on a single line, and it consists of four floating point numbers: r, R, H, V, representing the bottom radius, the top radius, the height and the volume of the hot water.

1. T <= 20.
2. 1 <= r, R, H <= 100; 0 <= V <= 1000,000,000.
3. r <= R.
4. r, R, H, V are separated by ONE whitespace.
There is NO empty line between two neighboring cases.


For each test case, output the height of hot water on a single line. Please round it to six fractional digits.

Sample Input

100 100 100 3141562

Sample Output




Wuhan Univ. North Central China Contest 2009 (Final Round)
<Submit>   <Statistics>   <Discuss>

Powered by Zhang Zhaoning PDL College of Computer
Since 2006.03.09 | 2007.11.22 | 2010.03.02 Copyright (r) 2006 - 2010 All Rights Reserved