两条线相交于原点

Question

我怎样才能在 Latex 中绘制这些彩色的图画？

我并不关心两幅图中彩色线条的粗细，普通粗细就可以了。此外，第一个图下方的字母是 $\mathbb{G}_m$。

Answer 1

你可以说：

\documentclass{standalone}
\usepackage{amsmath,amssymb}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}[thick]
\draw[green] (240:1) -- (60:1); 
\draw[cyan] (-60:1) -- (120:1);
\draw[] (0:1) -- (180:1);
\fill[cyan] (0,0) circle(0.3);
\fill[green] (0,0) circle(0.2);
\fill[purple] (0,0) circle(0.1);
\node[] at (0.3,-1) {$\mathbb{G}_m$};
\node[] at (1.5,0.5) {$\mathbb{A}^2\backslash \{0\}$};
\end{tikzpicture} 

\begin{tikzpicture}[thick]
\draw[cyan] (45:1) -- (225:1);
\draw[cyan] (135:1) -- (315:1);
\draw[] (0:1) -- (180:1);
\draw[] (90:1) -- (270:1);
\draw[fill=white] (0,0) circle(0.15);
\node[] at (1.5,0.5){$\mathbb{A}^2\backslash \{0\}$};
\end{tikzpicture}
\end{document}