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\input{preamble-standalone.ltx}
\begin{document}
% Ex. No. 183 (Section 21.4.3 : Mix of styles)
\begin{tikzpicture}[scale=.75]
\tkzDefPoint(0,0){A}
\tkzDefPoint(4,1){B}
\tkzDefPoint(2,5){C}
\tkzDefPointBy[projection=onto B--A](C)
\tkzGetPoint{H}
\tkzDrawLine(A,B)
\tkzDrawLine[add = .5 and .2,color=red](C,H)
\tkzMarkRightAngle[,size=1,color=red](C,H,A)
\tkzMarkRightAngle[german,size=.8,color=blue](B,H,C)
\tkzFillAngle[opacity=.2,fill=blue!20,size=.8](B,H,C)
\tkzLabelPoints(A,B,C,H)
\tkzDrawPoints(A,B,C)
\end{tikzpicture}
\end{document}
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