Variables declared in header, undefined according to declaration

I'm quite new to this and do not understand this fully yet, but I'm trying to create a class using variables. One of these variables is of a different class
(Class Circle, which has a center of class point). I've done this before, but for some reason when I implement point center or radius in my definition file this gives me an error saying it isn't declared...

What I have so far is this:

#include <iostream>
#ifndef CIRCLE_H
#define CIRCLE_H
#include "point.h"

using namespace std;

class circle{

public:

...

private:
point center;
double radius;
};

#endif

Thanks in advance!
Think I got it, forgot circle:: in my declaration file...
when I implement point center or radius in my definition

Where do you try to implement these?

Aceix.
Problem has been resolved, thanks though.
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