solution of -CIRCLE_E - Three Circle Problem (EASY) on spoj

solution-

Given 3 distinct circles with positive integer radius R1, R2, and R3, and arranged like in the picture below:

Now, your task is to compute radius of small circle that can be created like yellow circle in the picture above. All circles in the picture above tangent each other.

Input-

The first line in the input data, there is an integer T(0 < T ≤ 103) denoting number of test cases, than T lines follow.

For each lines, there are three integer R1, R2, and R3, (0 < {R1,R2,R3} < 109) denoting radius of each circle like in the picture above.

ATTENTION-

take input in float-

SYNTAX-

#include<stdio.h>

#include<math.h>

#include<stdlib.h>

int main()

{double a,b,c,t;

double r;

scanf("%lf",&t);

while(t--)

{

scanf("%lf%lf%lf",&a,&b,&c);

if(a>0&&b>0&&c>0)

{ r=a*b*c/(2*sqrt(a*b*c*(a+b+c))+a*b+b*c+c*a);

printf("%lf\n",r);

}

}

}