![乳胶中的圆圈](https://linux22.com/image/465872/%E4%B9%B3%E8%83%B6%E4%B8%AD%E7%9A%84%E5%9C%86%E5%9C%88.png)
答案1
像这样:
代码:
\documentclass[10pt,a4paper]{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}[scale=3]
\coordinate (0,0) node[left] (O) {O};
\draw[-latex] (0,0)--(1.3,0) node[right] () {$x$};
\draw (0,0) circle(1cm);
\fill (63:1) circle(1pt);
\draw (0,0)--(63:1) node[midway,left] () {$V$};
\draw[dashed] ({cos(63)},0)--(63:1);
\draw[latex-latex] (1.12,0) arc (0:63:1.12) node[midway,fill=white] () {$V$};
\node at (63:1.2) (a) {P$(x,y)$};
\end{tikzpicture}
\end{document}
添加:为了获得更完整的图片:
输入以下代码:
\documentclass[10pt,a4paper]{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}[scale=3]
\coordinate (0,0) node[above left] (O) {O};
\draw[-latex] (0,0)--(1.3,0) node[right] () {$x$};
\draw (0,0) circle(1cm);
\fill (63:1) circle(1pt);
\draw (0,0)--(63:1) node[midway,left] () {$V$};
\draw[dashed] ({cos(63)},0)--(63:1);
\draw[latex-latex] (1.12,0) arc (0:63:1.12) node[midway,fill=white] () {$V$};
\node at (63:1.2) (a) {P$(x,y)$};
\draw[-latex] (.25,0) arc(0:63:.25) node[midway,right] () {1 radiant};
\draw[-latex] (.2,0) arc(0:360:.2) node[pos=.75,below] () {$2\pi$ radiants};
\end{tikzpicture}
\end{document}
编辑:为了获得更加真实的图像,将上面代码中的所有值“63”更改为“57.3”(1 度辐射点)。