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

% Ex. No. 97 (Section 16.2.2 : triangle 30 60 90 (school))

\begin{tikzpicture}
\tkzInit[ymin=-2.5,ymax=0,xmin=-5,xmax=0]
\tkzClip[space=.5]
\begin{scope}[rotate=-180]
  \tkzDefPoint(0,0){A} \tkzDefPoint(4,0){B}
  \tkzDrawTriangle[school,fill=red!30](A,B)
  \tkzMarkRightAngles(B,A,tkzPointResult)
\end{scope}
\end{tikzpicture}

\end{document}
