#include <iostream>
#include <cmath>
using namespace std;

int main()
{
  // Prompt the user to enter three points
  cout << "Enter three points: ";
	double x1, y1, x2, y2, x3, y3;
  cin >> x1 >> y1 >> x2 >> y2 >> x3 >> y3;
    
  // Compute three sides
  double a = sqrt((x2 - x3) * (x2 - x3) + (y2 - y3) * (y2 - y3));
  double b = sqrt((x1 - x3) * (x1 - x3) + (y1 - y3) * (y1 - y3));
  double c = sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
    
  // Obtain three angles in radians
  double A = acos((a * a - b * b - c * c) / (-2 * b * c));
  double B = acos((b * b - a * a - c * c) / (-2 * a * c));
  double C = acos((c * c - b * b - a * a) / (-2 * a * b));
    
  // Display the angles in degress
	const double PI = 3.14159;
  cout << "The three angles are " << A * 180 / PI << " " 
		<< B * 180 / PI << " " << C * 180 / PI << endl;
  
	return 0;
}