/*******************************
*  Bismillahir Rahmanir Rahim
*  Harunur Rashid
********************************

************Template Starts Here***********/

#include<bits/stdc++.h>

using namespace std;

#define endl     "\n"
#define eps      1e-9
#define sf       scanf
#define xx       first
#define yy       second
#define pf       printf
#define ppb      pop_back
#define sqr(x)   ((x)*(x))
#define mp       make_pair
#define pb       push_back
#define pi       acos(-1.0)
#define mod      1000000007
#define pr(a)    cout<<a<<"\n"
#define sz(x)    ((int)x.size())
#define all(a)   a.begin(),a.end()
#define mem(a,b) memset(a,b,sizeof(a))
#define lcm(a,b) (abs(a)/gcd(a,b))*abs(b)

typedef long long int          lld;
typedef unsigned long long int llu;
typedef vector<int>            vi;
typedef pair<int,int>          pii;

template<class T>
T mod_f(T num)
{
    if(num>=0) return num%mod;
    else       return ((num%mod)+mod)%mod;
}

template<class T>
T fast_pow(T b,T p)
{
    if(p==0)
        return 1;
    if(p%2)
    {
        T x=mod_f(mod_f(b)*mod_f(fast_pow(b,p-1)));
        return x;
    }
    else
    {
        T x=mod_f(fast_pow(b,p/2));
        x=mod_f(mod_f(x)*mod_f(x));
        return x;
    }
}

template<class T>
T gcd(T a,T b)
{
    a=abs(a);
    b=abs(b);
    while(b)
    {
        T r=a%b;
        a=b;
        b=r;
    }
    return a;
}

/*/ 4 direction ....

int dx[]= {+0,+1,+0,-1};
int dy[]= {+1,+0,-1,+0};

// 8 direction ....

int dx[]= {+0,+1,+1,+1,+0,-1,-1,-1};
int dy[]= {+1,+1,+0,-1,-1,-1,+0,+1};

// Knight direction...

int dx[]= {+1,-1,+2,-2,+2,-2,+1,-1};
int dy[]= {+2,+2,+1,+1,-1,-1,-2,-2};
*/

/***********Template Ends Here***********/

double area(double a,double b,double c)
{
    double s=(a+b+c)/2;
    return sqrt(s*(s-a)*(s-b)*(s-c));
}

int main()
{
    int T;
    double r1,r2,r3,A,low,high,r,X,Y,Z;
    scanf("%d",&T);
    while(T--)
    {
        scanf("%lf%lf%lf",&r1,&r2,&r3);
        A=area(r1+r2,r1+r3,r2+r3);
        low=0;
        high=1000000000;
        while(high-low>eps)
        {
            r=(low+high)/2;
            X=area(r1+r2,r1+r,r2+r);
            Y=area(r1+r3,r1+r,r3+r);
            Z=area(r2+r3,r2+r,r3+r);
            if(X+Y+Z<A) low=r;
            else high=r;
        }
        printf("%.6lf\n",r);
    }
    return 0;
}