\begin{center}
\begin{tikzpicture}
\draw (0,0) grid (3,2);
\draw [shift={(1,1)},line width=1.2pt, color=green, fill=green!50!black,fill opacity=0.1] (26.56505117707799:0.6209213230591549) arc (26.56505117707799:45:0.6209213230591549);
\draw [shift={(0,0)},line width=1.2pt,color=red,fill=red,fill opacity=0.1] (0:0.6209213230591549) arc (0:18.43494882292201:0.6209213230591549);
\draw  (0,0)-- (3,0);
\draw  (0,0)-- (3,1);
\draw (1,1)-- (2,2);
\draw  (1,1)-- (3,2);
\draw (-0.19074479512700815,-0.1738926178663915) node {$A$};
\draw (3.2,0.1) node {$B$};
\draw (3.2,1.1) node {$C$};
\draw (0.8,0.7) node {$D$};
\draw (2.094245673730682,2.1731899832972137) node {$E$};
\draw (3.100138217086513,2.1731899832972137) node {$F$};
\draw[color=green!50!black] (1.8,1.5) node {$\beta$};
\draw[color=red] (1,0.15) node {$\alpha$};
\end{tikzpicture}
\end{center}

Comparer la mesure des angles $\alpha$ et $\beta$.

