My program dont work on sample test.

#include <iostream>
#include <cmath>

using namespace std;

#define x1 x11
#define y1 y11
#define z1 z11

int x1,x2,x3,y1,y2,y3,z1,z2,z3,r,v1x,v1y,v2x,v2y,v1z,v2z;
long double l,d1,d2,a,t1,t2,b,b1,b2;

const long double pi = 3.1415926535897932384626433832795;

int main()
{
    cout.setf(ios::fixed | ios::showpoint);
    cout.precision(2);
    cin >> x1 >> y1 >> z1 >> x2 >> y2 >> z2 >> x3 >> y3 >> z3 >> r;
    d1 = sqrt((double)(x3-x1)*(x3-x1)+(y3-y1)*(y3-y1)+(z3-z1)*(z3-z1));
    d2 = sqrt((double)(x3-x2)*(x3-x2)+(y3-y2)*(y3-y2)+(z3-z2)*(z3-z2));
    l = sqrt((double)-r*r+d1*d1)+sqrt((double)-r*r+d2*d2);
    v1x = x1-x3;
    v1y = y1-y3;
    v1z = z1-z3;
    v2x = x2-x3;
    v2y = y2-y3;
    v2z = z2-z3;

    t1 = sqrt((double)v1x*v1x+v1y*v1y+v1z*v1z);
    t2 = sqrt((double)v2x*v2x+v2y*v2y+v2z*v2z);
    a = acos((double)(v1x*v2x+v1y*v2y+v1z*v2z)/(t1*t2));
    if ((a/pi)*360.0>180.0) a = pi-a;
    b1 = acos((double)r/d1);
    b2 = acos((double)r/d2);
    a = a-b1-b2;
    cout << (a/pi)*360.0 << endl;
    l = l+(double)(2.0*r*a);
    cout << l;
    return 0;
}