\input{preamble-standalone.ltx}
\begin{document}

% Ex. No. 194 (Section 23.1.3 : \tkzcname{tkzDrawSector} and \tkzname{R})

\begin{tikzpicture}[scale=1.25]
 \tkzDefPoint(0,0){O}
 \tkzDefPoint(2,-1){A}
 \tkzDrawSector[R,draw=white,%
 fill=red!50](O,2cm)(30,90)
 \tkzDrawSector[R,draw=white,%
 fill=red!60](O,2cm)(90,180)
 \tkzDrawSector[R,draw=white,%
 fill=red!70](O,2cm)(180,270)
 \tkzDrawSector[R,draw=white,%
 fill=red!90](O,2cm)(270,360)
\end{tikzpicture}

\end{document}