答案1
我认为最简单的方法是这样的:
\documentclass[10pt, border=.3cm]{standalone}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\draw[fill=gray] (0,0) arc (180:0:1cm);
\draw[fill=white] (0,0) -- (2cm,0) -- (1cm,1cm)-- (0,0);
\end{tikzpicture}
\end{document}
如果你喜欢灰色边框而不是黑色边框:
\documentclass[10pt, border=.3cm]{standalone}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\filldraw[gray] (0,0) arc (180:0:1cm);
\draw[gray, fill=white] (0,0) -- (2cm,0) -- (1cm,1cm)-- (0,0);
\end{tikzpicture}
\end{document}