\input{preamble-standalone.ltx} \begin{document} % Ex. No. 125 (Section 19.1.8 : Spieker circle) \begin{tikzpicture}[scale=1] \tkzDefPoints{ 0/0/A,4/0/B,0.8/4/C} \tkzDefSpcTriangle[medial](A,B,C){Ma,Mb,Mc} \tkzDefTriangleCenter[spieker](A,B,C) \tkzGetPoint{Sp} \tkzDrawPolygon[blue](A,B,C) \tkzDrawPolygon[red](Ma,Mb,Mc) \tkzDrawPoints[blue](B,C,A) \tkzDrawPoints[red](Ma,Mb,Mc,Sp) \tkzDrawCircle[in,red](Ma,Mb,Mc) \tkzAutoLabelPoints[center=Sp,dist=.3](Ma,Mb,Mc) \tkzLabelPoints[blue,right](Sp) \tkzAutoLabelPoints[center=Sp](A,B,C) \end{tikzpicture} \end{document}