![alt text][1] \documentclass[border=5pt]{standalone} \usepackage{amsmath} \usepackage{tikz} \usetikzlibrary{positioning} \begin{document} \begin{tikzpicture}[% x={(1cm,0cm)}, y={(0cm,1cm)}, z={({0.5*cos(45)},{0.5*sin(45)})}, ] \def\a{2} \begin{tikzpicture}[% x={(1cm,0cm)}, y={(0cm,1cm)}, z={({0.5*cos(45)},{0.5*sin(45)})}, ] \coordinate (A) at (0,0,0); \coordinate (B) at (\a,0,0) ; \coordinate (C) at (\a,\a,0); \coordinate (D) at (0,\a,0); \coordinate (E) at (0,0,\a); \coordinate (F) at (\a,0,\a); \coordinate (G) at (\a,\a,\a); \coordinate (H) at (0,\a,\a); %Ecken \node[left= 1pt of A]{$A$}; \node[right= 1pt of B]{$B$}; \node[right= 1pt of C]{$C$}; \node[left= 1pt of D]{$D$}; \node[left= 1pt of E]{$E$}; \node[right= 1pt of F]{$F$}; \node[right= 1pt of G]{$G$}; \node[left= 1pt of H]{$H$}; %Kanten \draw[] (A) -- (B) node[midway, below]{\tiny$\a$cm} -- (C) node[midway, right]{\tiny$\a$cm} -- (D) node[midway, above]{\tiny$\a$cm} -- (A) node[midway, left]{\tiny$\a$cm}; \draw[] (B) -- (F) -- (G) -- (C); \draw[] (G) -- (H) -- (D); \draw[densely dashed] (A) -- (E) -- (F); \draw[densely dashed] (E) -- (H); \end{tikzpicture} \end{document} [1]: http://texwelt.de/wissen/upfiles/Namenlos-11e4yyy_24.png

![alt text][1] \documentclass[border=5pt]{standalone} \usepackage{amsmath} \usepackage{tikz} \usetikzlibrary{positioning} \begin{document} \def\a{2} \begin{tikzpicture}[% x={(1cm,0cm)}, y={(0cm,1cm)}, z={({cos(45)},{sin(45)})}, z={({0.5*cos(45)},{0.5*sin(45)})}, ] \coordinate (A) at (0,0,0); \coordinate (B) at (\a,0,0) ; \coordinate (C) at (\a,\a,0); \coordinate (D) at (0,\a,0); \coordinate (E) at (0,0,\a); \coordinate (F) at (\a,0,\a); \coordinate (G) at (\a,\a,\a); \coordinate (H) at (0,\a,\a); %Ecken \node[left= 1pt of A]{$A$}; \node[right= 1pt of B]{$B$}; \node[right= 1pt of C]{$C$}; \node[left= 1pt of D]{$D$}; \node[left= 1pt of E]{$E$}; \node[right= 1pt of F]{$F$}; \node[right= 1pt of G]{$G$}; \node[left= 1pt of H]{$H$}; %Kanten \draw[] (A) -- (B) node[midway, below]{\tiny$\a$cm} -- (C) node[midway, right]{\tiny$\a$cm} -- (D) node[midway, above]{\tiny$\a$cm} -- (A) node[midway, left]{\tiny$\a$cm}; \draw[] (B) -- (F) -- (G) -- (C); \draw[] (G) -- (H) -- (D); \draw[densely dashed] (A) -- (E) -- (F); \draw[densely dashed] (E) -- (H); \end{tikzpicture} \end{document} [1]: http://texwelt.de/wissen/upfiles/Namenlos-11e4yyy_23.pnghttp://texwelt.de/wissen/upfiles/Namenlos-11e4yyy_24.png

![alt text][1] \documentclass[border=5pt]{standalone} \usepackage{amsmath} \usepackage{tikz} \usetikzlibrary{positioning} \begin{document} \def\a{2} \begin{tikzpicture}[% x={(1cm,0cm)}, y={(0cm,1cm)}, z={({cos(45)},{sin(45)})}, ] \coordinate (A) at (0,0,0); \coordinate (B) at (\a,0,0) ; \coordinate (C) at (\a,\a,0); \coordinate (D) at (0,\a,0); \coordinate (E) at (0,0,\a); \coordinate (F) at (\a,0,\a); \coordinate (G) at (\a,\a,\a); \coordinate (H) at (0,\a,\a); %Ecken \node[left= 1pt of A]{$A$}; \node[right= 1pt of B]{$B$}; \node[right= 1pt of C]{$C$}; \node[left= 1pt of D]{$D$}; \node[left= 1pt of E]{$E$}; \node[right= 1pt of F]{$F$}; \node[right= 1pt of G]{$G$}; \node[left= 1pt of H]{$H$}; %Kanten \draw[] (A) -- (B) node[midway, below]{\tiny$\a$cm} -- (C) node[midway, right]{\tiny$\a$cm} -- (D) node[midway, above]{\tiny$\a$cm} -- (A) node[midway, left]{\tiny$\a$cm}; \draw[] (B) -- (F) -- (G) -- (C); \draw[] (G) -- (H) -- (D); \draw[densely dashed] (A) -- (E) -- (F); \draw[densely dashed] (E) -- (H); \end{tikzpicture} \end{document} [1]: http://texwelt.de/wissen/upfiles/Namenlos-11e4yyy_23.png