\documentclass{scrartcl} \usepackage[utf8]{inputenc} \usepackage[upright]{fourier} \usepackage[usenames,dvipsnames]{xcolor} \usepackage{fullpage,amsmath,tkz-euclide} \definecolor{fondpaille}{cmyk}{0,0,0.1,0} \pagecolor{fondpaille} \color{Maroon} \tkzSetUpColors[background=fondpaille,text=Maroon] \thispagestyle{empty} \begin{document} \begin{tikzpicture} \tkzDefPoint(0,0){A} \tkzDefPoint(5,0){C} \tkzDefPoint(0,5){B} \tkzDrawLine[](A,C) \tkzDrawArc(A,C)(B) \tkzDefMidPoint(A,C)\tkzGetPoint{I} \tkzDrawSegment[color=gray,style=dashed](I,B) \tkzDuplicateSegment(I,B)(I,A)\tkzGetPoint{D} \tkzDrawArc[color=gray,style=dashed](I,B)(D) \tkzDuplicateSegment(A,D)(A,B)\tkzGetPoint{E} \tkzDuplicateSegment(A,D)(B,A)\tkzGetPoint{G} \tkzDrawArc[color=gray,style=dashed](A,D)(B) \tkzInterCC(A,C)(B,G)\tkzGetPoints{K}{F} \tkzDrawArc[color=gray,style=dashed](B,G)(F) \tkzDrawPoint(F) \tkzCompass(B,F) \tkzDrawPolygon[color=red](A,B,F) \end{tikzpicture} \end{document}