// Triangle.cpp: implementation of the CTriangle class.
//
//////////////////////////////////////////////////////////////////////

#include "Triangle.h"
#include <math.h>

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CTriangle::CTriangle()
{

}

CTriangle::~CTriangle()
{

}

double CTriangle::Surface()
{
  double perimeter;
  double half_perimeter;
  double S; // Surface.
  int i;

  (this)->sides(); // takes the instance itself.

  perimeter=0;
  for(i=0;i<n;i++)
  {
	  perimeter+=side_length[i];
  }

  half_perimeter=0.5*perimeter;
  S=sqrt(half_perimeter*(half_perimeter-side_length[0])*
	  (half_perimeter-side_length[1])*
	  (half_perimeter-side_length[2]));

  return S;
}

CTriangle::CTriangle(int n_sides)
{
	p_point=new CPoint[n_sides];
	n=n_sides;
}