\begin{tikzpicture}[scale=1.5] \tkzDefPoint(0,0){O} \tkzDefPoint(2,-1){A} \tkzDefPoint(1,1){B} \tkzDrawSector[color=blue,dashed](O,A)(B) \tkzDrawSector[color=blue](O,B)(A) \tkzClipBB \begin{scope} \tkzClipSector(O,B)(A) \draw[fill=gray!20] (-1,0) rectangle (3,3); \end{scope} \tkzDrawPoints(A,B,O) \end{tikzpicture}