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\input{preamble-standalone.ltx}
\begin{document}
% Ex. No. 249 (Section 31.3.2 : Another example of of\tkzcname{tkzSetUpCompass})
\begin{tikzpicture}[scale=1,rotate=90]
\tkzDefPoints{0/1/A, 8/3/B, 3/6/C}
\tkzDrawPolygon(A,B,C)
\tkzSetUpCompass[color=brown,
line width=.3 pt,style=tkzdotted]
\tkzDefLine[bisector](B,A,C) \tkzGetPoint{a}
\tkzDefLine[bisector](C,B,A) \tkzGetPoint{b}
\tkzInterLL(A,a)(B,b) \tkzGetPoint{I}
\tkzDefPointBy[projection= onto A--B](I)
\tkzGetPoint{H}
\tkzMarkRightAngle(I,H,A)
\tkzDrawCircle[radius,color=red](I,H)
\tkzDrawSegments[color=red](I,H)
\tkzDrawLines[add=0 and -.5,,color=red](A,a)
\tkzDrawLines[add=0 and 0,color=red](B,b)
\tkzShowLine[bisector,size=2,gap=3](B,A,C)
\tkzShowLine[bisector,size=1,gap=3](C,B,A)
\tkzLabelPoints(A,B)\tkzLabelPoints[left](C)
\end{tikzpicture}
\end{document}
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