Re: tikz intersezione retta circonferenza

grufolando qua e la
ho scritto il seguente codice
`
\usetikzlibrary{shapes,arrows,trees,positioning,through,intersections}
\usetikzlibrary{calc}
\def\raggio{2cm};
\begin{tikzpicture}
\coordinate [label=$C$] (C) at (0,0);
\node (D) at (0,2) {};
\node (F) at(1,2){};
\node (cc) [name path=cc,draw,circle through=(D)] at (C) {};
\path [name path=C–F] (C) — (F);
\path [name intersections={of=cc and C–F}];
\coordinate [label=above:$A$] (M) at (intersection-1);

\path [name path=C–D] (C) — (D);
\path [name intersections={of=cc and C–D}];
\coordinate [label=above:$B$] (N) at (intersection-1);

\draw (C) –(M);
\draw(C)–(N);
\end{tikzpicture}
`

ma non funziona 🙁
perché le coordinate di N
non sono corrette?
Claudio