\begin{tabular}{|l} All quadrilaterals have -... \\ \begin{tabular}{|lll}\hline 4 right angles & (1) & sides \\ \hline 4 sides the same length \\ \hline\end{tabular}\end{tabular}

It looks like you’re creating a table to ask which property is universal for all quadrilaterals. While some quadrilaterals (like rectangles or squares) have four right angles or four sides of equal length, the only feature that every quadrilateral shares is that it has four sides. If you want to show this in a table, here’s one way to correct and simplify your LaTeX code: -------------------------------------------------- \documentclass{article} \usepackage{array} \begin{document} \begin{tabular}{|l|} \hline All quadrilaterals have... \\ \hline \begin{tabular}{ll} Option & Property \\ \hline (1) & 4 right angles \\ (2) & 4 sides of equal length \\ (3) & \textbf{4 sides} \\ \end{tabular} \\ \hline \end{tabular} \end{document} -------------------------------------------------- In this example, option (3) (“4 sides”) is the property that every quadrilateral has. So the correct answer is: every quadrilateral has four sides.