Cup
Time Limit: 20000/20000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)
Problem Description
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.
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.
Output
For each test case, output the height of hot water on a single line. Please round it to six fractional digits.
Sample Input
