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Time Limit: 1.0 Seconds Memory Limit: 65536K

Total Runs: 1345 Accepted Runs: 308

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.
### Input

The input consists of several test cases. The first line of input contains an integer *T*, indicating the num of test cases.### Output

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

### Sample Output

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.

**Technical Specification**

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.

5. There is NO empty line between two neighboring cases.

1 100 100 100 3141562

99.999024

Maintance:Fxz. Developer: SuperHacker, G.D.Retop, Fxz