## Help with program involving Classes member functions

I'm suppose to create a program with a class with four members function to calculate the area of a triangle, square, hexagon, octagon with you enter the length of the side.

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#include <iostream>
using namespace std;

class Area
{

private:

double L;

public:

Area(double L);
void SideLength();
void CalcAreaTriangle();
void CalcAreaSquare();
void CalcAreaHexagon();
void CalcAreaOctagon();

};

void Area::SideLength()
{
cout << "Enter the length of the side";
cin >> L;
}
void Area::CalcAreaTriangle()
{
cout << 0.433013*L*L;
}
void Area::CalcAreaSquare()
{
cout << L*L;
}
void Area::CalcAreaHexagon()
{
cout << 2.59808*L*L;
}
void Area::CalcAreaOctagon()
{
cout << 4.82843*L*L;
}

int main ()
{
double L;
Area CalcAreaTriangle(L);
Area CalcAreaSquare(L);
Area CalcAreaHexagon(L);
Area CalcAreaOctagon(L);

cout << "Area Trinagle = ";
CalcAreaTriangle(L);
cout << "Area Square = ";
CalcAreaSquare(L);
cout << "Area Hexagon = ";
CalcAreaHexagon(L);
cout << "Area Octagon = ";
CalcAreaOctagon(L);
cout << endl;

system ("pause");
return 0;
}