\input{preamble-standalone.ltx} \begin{document} % Ex. No. 8 (Section 1.3.2 : Example Part II: two others methods gold and euclide triangle) \begin{tikzpicture} \tkzDefPoint(0,0){C} % possible % \tkzDefPoint[label=below:$C$](0,0){C} % but don't do this \tkzDefPoint(2,6){B} % We get D and E with a rotation \tkzDefPointBy[rotation= center B angle 36](C) \tkzGetPoint{D} \tkzDefPointBy[rotation= center B angle 72](C) \tkzGetPoint{E} % To get A we use an intersection of lines \tkzInterLL(B,E)(C,D) \tkzGetPoint{A} \tkzInterLL(C,E)(B,D) \tkzGetPoint{H} % drawing \tkzDrawArc[delta=10](B,C)(E) \tkzDrawPolygon(C,B,D) \tkzDrawSegments(D,A B,A C,E) % angles \tkzMarkAngles(C,B,D E,A,D) %this is to draw the arcs \tkzLabelAngles[pos=1.5](C,B,D E,A,D){$\alpha$} \tkzMarkRightAngle(B,H,C) \tkzDrawPoints(A,...,E) % Label only now \tkzLabelPoints[below left](C,A) \tkzLabelPoints[below right](D) \tkzLabelPoints[above](B,E) \end{tikzpicture} \end{document}