[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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