## Problem F: Largest inscribed rectangle

Output the maximum area of a rectangle that can be inscribed into a circle of radius R. Rectangle's shorter side should not be longer than B.

### Input Format

First line of the input contains an integer T (1 <= T <= 1000) - the number of test cases.
Next T lines each contain two integers R and B (1 <= R,B <= 10000).

### Output Format

For each test case print on a separate line the maximum area of a rectangle with a maximum shorter side B
that can be inscribed into a circle of radius R. Your answer should be rounded to three digits after the decimal point (see sample output).

### Sample Input

3
1 1
1 2
2 2

### Sample Output

1.732
2.000
6.928

*Hichem Zakaria Aichour*

**CCPC 2013**