I have to define a class for equilateral triangles. The triangle should be defined by a center point (x, y) and the length of the sides. The class should have a constructor which allows defining the triangle, a constructor with no arguments, and member functions for the x coordinate, y coordinate, length, height, perimeter, area, and distance from the center to the vertex.

I have to define triangle1, and triangle2. triangle1 has no values defined. triangle2 will have x coordinate of 5.0, y coordinate of 8.3, and length of 10.0. All the member functions should work for both triangles. Then triangle2 should be reset to x=7.0, y=3.0, and length = 6.5 and show the functions work.

I can't get the values set for triangle 2 and i have no idea what i should do. i have been trying to figure it out for over an hour. any help would be appreciated. this is what i have done so far...

```
#include<iostream.h>
#include<math.h>
class Etriangle
{
public:
Etriangle (float x,float y,float length);
Etriangle ();
float height();
float perimeter();
float area();
float dist();
void output(ostream &output);
private:
float length, x, y;
};
void main()
{
Etriangle triangle1, triangle2(5.0, 8.3, 10.0);
cout<<"Triangle 1 is initialized as:\n";
triangle1.output(cout);
cout<<"\nTriangle 2 is initialized as:\n";
triangle2.output(cout);
triangle2 = Etriangle(7.0, 3.0, 6.5);
cout<<"\nTriangle 2 is now set as:\n";
triangle2.output(cout);
}
Etriangle::Etriangle()
{
x=0;
y=0;
length=0;
}
Etriangle::Etriangle(float x, float y, float length)
{
x = 5.0;
y = 8.3;
length = 10.0;
}
float Etriangle::area()
{
float s;
s = (length + length + length) / 2;
return (sqrt(s*(s-length)*(s-length)*(s-length)));
}
float Etriangle::dist()
{
return(length * length * length) / (4 * area());
}
float Etriangle::height()
{
return (sqrt((length*length)-((length/2)*(length/2))));
}
float Etriangle::perimeter()
{
return (length + length + length);
}
void Etriangle::output(ostream &output)
{
output << "X = " << x << endl;
output << "Y = " << y << endl;
output << "Length = " << length << endl;
output << "Height = " << height() << endl;
output << "Perimeter = " << perimeter() << endl;
output << "Area = " << area() << endl;
output << "Distance from center to vertex = " << area() << endl;
}
```