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\vspace{ 2cm} Start\\ \begin{tikzpicture} \tkzDefPoint(-2,-2){A} \tkzDefPoint(2,1){B} \tkzDefPoint(0,0){O} \tkzSaveBB \tkzShowBB[red,line width=1pt] \tkzRestoreBB \tkzDrawCircle(O,B) \tkzClipBB \tkzFillCircle[gray!20](O,B) \end{tikzpicture} End