Il est possible de modifier et de compiler cet exemple :
\documentclass[border=10pt]{standalone}
\usepackage{tkz-euclide}
\begin{document}
\begin{tikzpicture}
\tkzDefPoints{0/0/A,12/0/B,6/12*sind(60)/C}
\foreach \density in {20,30,...,240}{%
\tkzDrawPolygon[fill=teal!\density](A,B,C)
\pgfnodealias{X}{A}
\tkzDefPointWith[linear,K=.15](A,B) \tkzGetPoint{A}
\tkzDefPointWith[linear,K=.15](B,C) \tkzGetPoint{B}
\tkzDefPointWith[linear,K=.15](C,X) \tkzGetPoint{C}}
\end{tikzpicture}
\end{document}