\input{preamble-standalone.ltx} \begin{document} % Ex. No. 217 (Section 26.3.1 : Use of \tkzcname{tkzSetUpCompass}) \begin{tikzpicture}[scale=.75, showbi/.style={bisector,size=2,gap=3}] \tkzSetUpCompass[color=blue,line width=.3 pt] \tkzDefPoints{0/1/A, 8/3/B, 3/6/C} \tkzDrawPolygon(A,B,C) \tkzDefLine[bisector](B,A,C) \tkzGetPoint{a} \tkzDefLine[bisector](C,B,A) \tkzGetPoint{b} \tkzShowLine[showbi](B,A,C) \tkzShowLine[showbi](C,B,A) \tkzInterLL(A,a)(B,b) \tkzGetPoint{I} \tkzDefPointBy[projection= onto A--B](I) \tkzGetPoint{H} \tkzDrawCircle[radius,color=gray](I,H) \tkzDrawSegments[color=gray!50](I,H) \tkzDrawLines[add=0 and -.2,color=blue!50 ](A,a B,b) \tkzShowBB \end{tikzpicture} \end{document}