Jan’s LightOJ :: 1331 - Agent J Solution

1331 - Agent J

#include <stdio.h>
#include <math.h>
const double EPS = 1e-9;
int main()
    {
    int i,T;
    scanf("%d",&T);
    double r1,r2,r3,a,b,c,s,area,A,B,C,result;
    for(i =0; i<T; i++) {
            scanf("%lf%lf%lf",&r1,&r2,&r3);
            a = r1+r2;
            b = r2+r3;
            c = r3 + r1;
            s = (a+b+c)*0.5;
            area = sqrt(s*(s-a)*(s-b)*(s-c));
            A = acos((a*a+c*c-b*b)/(2.0*a*c));
            B = acos((a*a+b*b-c*c)/(2.0*a*b));
            C = acos((b*b+c*c-a*a)/(2.0*b*c));
            result = area-A*r1*r1*0.5-B*r2*r2*0.5-C*r3*r3*0.5;
            printf("Case %d: %.8lf\n",i+1,result+EPS);
            }
    return 0;

    }