углы треугольника?

#include <iostream>
#include <cmath>
#include <iomanip>

using namespace std;

#define PI 3.14159265

class vector1
{
  public:
  double x1, y1, x2, y2;
  double length;

  vector1(double x1, double y1, double x2, double y2)
 {
   length = sqrt((x2-x1)*(x2-x1) + (y2-y1)*(y2-y1));
 }
};

struct vershina
{
  double x, y;
};

double sozdanie(vershina one, vershina two)
{
  vector1 a(one.x, one.y, two.x, two.y);
  double znach = a.length;
  return znach;
}

double ygol (double one, double two, double three)
{
 double znach;
 znach = (one*one + two*two - three*three)/(2*one*two);
 return znach;
}

int main ()
{
  vershina A, B, C;
  cin >> A.x >> A.y >> B.x >> B.y >> C.x >> C.y;

  double *arr = new double[3];

    arr[0] = sozdanie(A, B);
    arr[1] = sozdanie(B, C);
    arr[2] = sozdanie(A, C);

  double *result = new double[3];

  result[0] = acos(ygol(arr[1], arr[2], arr[0]))*180.0/PI;
  result[1] = acos(ygol(arr[0], arr[2], arr[1]))*180.0/PI;
  result[2] = 180 - result[0] - result[1];

  double znach = result[0];

  cout.precision(10);
  for (int i = 0; i < 3; i++)
  {
    if (znach < result[i])
     znach = result[i];
  }

  cout << fixed << znach;
}