#include<bits/stdc++.h>
#include <iostream>
#include<math.h>
using namespace std;
int main()
{
double c1,c2,c3,a,b,c,s,ang1,ang2,ang3,arc1,arc2,arc3,area,area1,area2;
int tc;
scanf("%d",&tc);
while(tc--){
scanf("%lf%lf%lf",&c1,&c2,&c3);
a=c1+c2;
b=c2+c3;
c=c1+c3;
s =(a+b+c)/2.0;
area1 = sqrt(s*(s-a)*(s-b)*(s-c));
ang1 = acos((b*b+c*c-a*a)/(2*b*c));
ang2 = acos((c*c+a*a-b*b)/(2*c*a));
ang3 = acos((a*a+b*b-c*c)/(2*a*b));
arc1 =(c3*c3*ang1) ;
arc2 =(c2*c2*ang3);//arc2 =(c3*c3*ang3) ;//arc2 =(c2*c2*ang3) ;
arc3 =(c1*c1*ang2); //arc3 =(c2*c2*ang2);*///arc3 =(c1*c1*ang2);
area2 = (arc1 +arc2 +arc3 )/2;
printf("%.6lf\n",area1-area2);
}
return 0;
}
