\documentclass{article}
\usepackage[default]{fontsetup}
\usepackage[x11names]{xcolor}
\usepackage{pstricks}
\pagestyle{empty}
 \definecolor{LightOrange} {cmyk}{0,0.2,0.4,0}%

\begin{document}

\ \

\vspace*{1cm}

\pspolygon(-1,0.001)(-1,0)(3,0)(3,0.001)(0,1.7320508)   %(3,0)(0,1.7320508)
\psset{origin={0,-1.7320508}}
\rput{-30}(0,1.7320508){\pspolygon[fillstyle=solid,fillcolor=LemonChiffon1](0,1.7320508)(3.4641,1.7320508)(3.4641,5.1961508)(0,5.1961508)}%πάνω δεξιά
\rput{60}(0,1.7320508){\pspolygon[fillstyle=solid,fillcolor=Orange1](0,1.7320508)(-2,1.7320508)(-2,3.7320508)(0,3.7320508)}%πάνω αριστερά
\psset{origin={0,0}}
\pspolygon[linewidth=0pt,fillstyle=solid,fillcolor=Orange1](-1,0)(-1,-4)(0,-4)(0,0)%κάτω τετράγωνο αριστερά
\pspolygon[linewidth=0pt,fillstyle=solid,fillcolor=LemonChiffon1](0,0)(0,-4)(3,-4)(3,0)%κάτω τετράγωνο δεξιά
\pspolygon(-1,0)(-1,-4)(3,-4)(3,0)%κάτω τετράγωνο
\psline[linestyle=dashed](0,1.7320508)(0,-4)
%αριστερά κάθετο τρίγωνο
\psline[linewidth=0.3pt,linestyle=dashed](0,1.7320508)(-1,-4)
%αριστερά οριζόντιο τρίγωνο
\psline[linewidth=0.3pt,linestyle=dashed](-2.74,1.0)(3,0)
%
\uput[100](0,1.8){$\Alpha$}
\uput[210](-1,0){$\Beta$}
\uput[-10](3,0){$\Gamma$}
\uput[-45](3,-4){$\Epsilon$}
\uput[225](-1,-4){$\Delta$}
\uput[-90](0,-4){$\Lambda$}
\uput[-45](0,0){$\Iota$}
\uput[90](-1.75,2.7){$\Eta$}
\uput[180](-2.7,1){$\Zeta$}
\uput[90](1.7,4.7){$\Theta$}
\uput[0](4.7,3){$\Kappa$}
\end{document}