计算圆柱的半径的问题，怎么用C语言的程序的设计的思想的方式怎么来实现的程序编写

Question

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