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Function Help

Univcplus (23)
I am trying to create a function that gets the area of a triangle with the user inputting the points (input is in another function). However, I cannot seem to get this to work, I keep getting an error along the lines of "Cannot use expression as function." I have tried googling a solution and have found none.

Here is the function 
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  <#include "Triangle .h"
#include <cmath>
Triangle ::setPoints (int p1x, int p1y, int p2x, int p2y, int p3x, int p3y)
{
  p1x=p1x;
  p1y=p1y;
  p2x=p2x;
  p2y=p2y;
  p3x=p3x;
  p3y=p3y;
}


Triangle::Triangle(double)
{
double area;
    area = (p1x(p2y-p3y)+p2x(p3y-p1y)+p3x(p1y-p2y))/2;







}/>


Here is the header File: 

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//Function Declarations
#ifndef TRIANGLE _H
#define TRIANGLE _H
#include <iostream>
#include <cmath>
using namespace std;
class Triangle
{
   //Member Variables
    public:
        Triangle (const);
        setPoints (const);
        getArea (const);
        getCenterPoint (const);


        virtual ~Triangle ();


//Overload Constructor

setPoints(int,int,int, int, int, int);
getArea (double);
Triangle(double);

//Private

    private:
       int p1x, p1y,  p2x, p2y, p3x, p3y;


};

#endif // TRIANGLE _H


Thanks for any help!
Duthomhas (13131)
p1x(p2y-p3y) is mathematical notation.

C++ requires explicit operators for everything:

p1x*(p2y-p3y)
Univcplus (23)
Thanks So much! I can't believe I forgot that.
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