# Why trapez shape width changes with text?

What I want is to have shapes that are of some width. Apparently trapezium doesn't want to behave and makes shapes larger if there is less text in them. The more text I put in a trapez, the smaller it gets. Can someone explain this and maybe find a solution so that the trapez behaves as a rectangle with respect to sizes?

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{shapes,positioning}
\tikzset{
trap/.style={
draw,
align=center,
minimum height=4em,
text width=5em,
trapezium,
trapezium left angle=70,
trapezium right angle=-70,
},
rect/.style={
draw,
align=center,
minimum height=4em,
text width=5em,
rectangle,
},
}
\begin{document}
\begin{tikzpicture}
\node [trap] (one)  { not5em}; %this has the largest width
\node [trap,below = of one] (two) {somehow smaller}; %this is smaller
\node [trap,below = of two] (three) {the smallest one}; %this is even smaller
\node [rect, right = of one] (one1)  {5em}; %this has the largest width
\node [rect,below = of one1] (two1) {same width}; %this is smaller
\node [rect,below = of two1] (three1) {again same width}; %this is even smaller
\end{tikzpicture}

\end{document}


• It seems that there is bug. If you add optiontrapezium stretches to preset for trapezium, then the widths are almost the same, but angles is slightly changed. – Zarko Aug 11 '15 at 0:32