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I never played with tikz before, so that's my first attempt. I simply love the following joke:
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{decorations.pathmorphing}
\usepackage{frcursive}
\begin{document}
Find $x$.
\begin{tikzpicture}
\draw (0,0) -- (4,0) node[midway,below] {4 cm...