#include<iostream>
#include<cstdio>
#include<cmath>
#include<cstring>
using namespace std;
int main()
{
int t, test;
double a, b, c, s, area;
double A, B, C;
scanf("%d", &test);
t=0;
while(t!=test)
{
scanf("%lf%lf%lf", &a, &b, &c);
if(a<=0 || b<=0 || c<=0)
{
printf("These are invalid inputs!\n");
t++;
continue;
}
A=(1/a);
B=(1/b);
C=(1/c);
s=(A+B+C)*(B+C-A)*(A-B+C)*(A+B-C);
if(s<0)
{
printf("These are invalid inputs!\n");
t++;
}
else
{
area=(1/s);
printf("%0.3lf\n", sqrt(area));
}
}
}
#include<cstdio>
#include<cmath>
#include<cstring>
using namespace std;
int main()
{
int t, test;
double a, b, c, s, area;
double A, B, C;
scanf("%d", &test);
t=0;
while(t!=test)
{
scanf("%lf%lf%lf", &a, &b, &c);
if(a<=0 || b<=0 || c<=0)
{
printf("These are invalid inputs!\n");
t++;
continue;
}
A=(1/a);
B=(1/b);
C=(1/c);
s=(A+B+C)*(B+C-A)*(A-B+C)*(A+B-C);
if(s<0)
{
printf("These are invalid inputs!\n");
t++;
}
else
{
area=(1/s);
printf("%0.3lf\n", sqrt(area));
}
}
}