3D 中的叉积

Question

我如何使用 Tikz 绘制这幅图？

Answer 1

这实际上不需要任何特殊的库等等。

\documentclass[border=3pt]{standalone}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\draw[-,fill=white!95!red](0,0)--(3,0)--(4,1)--(1,1)--cycle;
\node at (2,0.5) {$|\textcolor{blue}{a}\times \textcolor{red}{b}|$};
\draw[ultra thick,-latex,blue](0,0)--(3,0)node[midway,below]{$a$};
\draw[ultra thick,-latex,red](0,0)--(1,1)node[midway,above]{$b$};
\draw[ultra thick,-latex,blue!50!red](0,0)--(0,3)node[pos=0.7,right]{$a\times b$};
\draw (0.6,0) arc [start angle=0,end angle=45,radius=0.6]
node[pos=0.7,right]{$\theta$};
\end{tikzpicture}
\end{document}