\input{preamble-standalone.ltx} \begin{document} % Ex. No. 152 (Section 21.3.5 : Angle trisection) \begin{tikzpicture} \tikzset{arc/.style={color=gray,style=dashed}} \tkzDefPoints{0/0/a,0/5/I,5/0/J} \tkzDrawArc[angles](O,I)(0,90) \tkzDrawArc[angles,/tikz/arc](I,O)(90,180) \tkzDrawArc[angles,/tikz/arc](J,O)(-90,0) \tkzInterCC(O,I)(I,O)\tkzGetPoints{B}{C} \tkzInterCC(O,I)(J,O)\tkzGetPoints{D}{A} \tkzInterCC(I,O)(J,O)\tkzGetPoints{L}{K} \tkzDrawPoints(A,B,K) \foreach \point in {I,A,B,J,K}{% \tkzDrawSegment(O,\point)} \end{tikzpicture} \end{document}