triangle

#include <iostream>
#include <cmath>
#include <fstream>

using namespace std;

int triangle() {

  int x1, y1, x2, y2, x3, y3;
  float a, b, c, P, S;
  cin >> x1 >> y1 >> x2 >> y2 >> x3 >> y3;
  a = sqrt(pow(x1 - x2, 2) + pow(y1 - y2, 2));
  b = sqrt(pow(x1 - x3, 2) + pow(y1 - y3, 2));
  c = sqrt(pow(x3 - x2, 2) + pow(y3 - y2, 2));
  P = a + b + c;
  S = sqrt(P/2 * (P/2 - a) * (P/2 - b) * (P/2 - c));
  cout << P << endl <<  S;

  return 0;
}