<latex-image>

<latex-image label="unit-circle">
    \begin{tikzpicture}
        \draw[->] (-1.2,0) -- (1.2,0);
        \draw[->] (0,-1.2) -- (0,1.2);
        \draw (0,0) circle (1);
    \end{tikzpicture}
</latex-image>

<latex-image>
    \begin{tikzpicture}
        \draw (0,0) -- (2,0) -- (1,1.5) -- cycle;
    \end{tikzpicture}
</latex-image>