Gráficos de puntos, segmentos y rectángulos usando Tikz

Esta sección del curso está dedicada a la creación de gráficos en LaTeX.
esta es la parte Parte 1.

\documentclass{article}
% Autor: Favian Arenas
% farenasenator@gmail.com
% 2021-06-25
\usepackage{graphicx}
\usepackage{tikz}
\begin{document}
\begin{figure}
  \centering
  \begin{tikzpicture} 
    \coordinate (A) at (1,4);
    \coordinate (B) at (5,4);
    \coordinate (C) at (4,2);
    \coordinate (D) at (4,1.5);
    \coordinate (E) at (0,4);
    \coordinate (F) at (6,4);
    \coordinate (G) at (4,1);
    \draw (E) -- (F); 
    \draw (A) -- (C); 
    \draw (B) -- (C); 
    \draw (C) -- (D); 
    \draw[draw= black,fill=yellow!30] (3.5,0.5) rectangle(4.5,1.5);
    \node at (G){W};
    \node[above] at (A){A}; 
    \node[above] at (B){B}; 
  \end{tikzpicture}
  \caption{Masa en equilibrio}
  \label{ej1}
\end{figure}


\end{document}