Find the area of a triangle with all its three sides given as a,b and c.
The first line of input contains an integer T denoting the number of test cases. Each test case contains
three space-separated integers a,b and c.
Output the area of the triangle answer with a precision of 6 decimal places.The area is to be printed as 0.000000 if the triangle does not exist.
1<=a,b,c <= 100
2 2 3
3 4 5