Problem Description
One cylinder across another cylinder at right angles, tell the volume of the intersection of the cylinders.
Input
Multiple test cases, the number of them T is given in the very first line.
For each test case, two integers r1 and r2, meaning the radius of the two cylinders. ( 1 < r1, r2 < 80 )
Output
For each case, output the answer rounded to 2 digits after the decimal point.
Sample Input
1
4 4
Sample Output
341.33