[TiKZ] Méthode d’Archimède

\begin{tikzpicture}
%% CERCLE TRIGONOMETRIQUE
\draw (0,0) circle (4cm);

%% CENTRE DU CERCLE
\fill (0,0) circle (1.5pt);
\node at (0,0) [anchor=south] {$O$};

%% HEXAGONE INTERIEUR
\fill (3.46,0) circle (1.5pt);
\node at (3.46,0) [anchor=south east] {$I$};
\fill (3.46,-2) circle (1.5pt);
\node at (3.46,-2) [anchor=south east] {$A$};
\fill (3.46,2) circle (1.5pt);
\node at (3.46,2) [anchor= north east] {$B$};
\fill (0,4) circle (1.5pt);
\node at (0,4) [anchor=north] {$C$};
\fill (-3.46,2) circle (1.5pt);
\node at (-3.46,2) [anchor=north west] {$D$};
\fill (-3.46,-2) circle (1.5pt);
\node at (-3.46,-2) [anchor=south west] {$E$};
\fill (0,-4) circle (1.5pt);
\node at (0,-4) [anchor=south] {$F$};
\draw (3.46,-2) -- (3.46,2) -- (0,4) -- (-3.46,2) -- (-3.46,-2) -- (0,-4) -- cycle;

%% HEXAGONE EXTERIEUR
\fill (4,0) circle (1.5pt);
\node at (4,0) [anchor=west] {$I'$};
\fill (4,2.31) circle (1.5pt);
\node at (4,2.31) [anchor=south west] {$B'$};
\fill (4,-2.31) circle (1.5pt);
\node at (4,-2.31) [anchor=north west] {$A'$};
\fill (0,4.62) circle (1.5pt);
\fill (-4,2.31) circle (1.5pt);
\fill (-4,-2.31) circle (1.5pt);
\fill (0,-4.62) circle (1.5pt);
\draw (4,-2.31) -- (4,2.31) -- (0,4.62) -- (-4,2.31) -- (-4,-2.31) -- (0,-4.62) -- cycle;

%% TRIANGLES
\draw (0,0) -- (4,0);
\draw (0,0) -- (4,-2.31);
\draw (0,0) -- (4,2.31);
\end{tikzpicture}
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