\documentclass[preview]{standalone}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
		\draw[fill=red] (0,0) -- (1.8,0.8) -- (4,0) -- (0,0);
		\draw[fill=cyan] (1.8,0.8) -- (4.5,2) -- (5.5,1.2) -- (1.8,0.8);
		\draw[fill=teal] (4,0) -- (5.5,1.2) -- (7,0) -- (4,0);
		\node [below] at (0,0) {$A$};
		\node [below] at (4,0) {$Y$};
		\node [below] at (7,0) {$C$};
		\node [above right] at (5.5,1.2) {$Z$};
		\node [above] at (4.5,2) {$B$};
		\node [above left] at (2,0.8) {$X$};
\end{tikzpicture}
\end{document}