Draw a sphere with radius with TikZ. According to the figure
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may this can help: tex.stackexchange.com/questions/345420/…– samcarter_is_at_topanswers.xyzJan 13, 2017 at 19:42
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1some of the other answers suggested show very nice spheres, but none provides coding for the radius, which is an explicit request here.– barbara beetonJan 13, 2017 at 21:58
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1 Answer
It is always hard to get answers to questions on the form "draw this for me" without showing any effort your self. Next time try to start a solution and add a MWE to your question, then you have much higher chance of getting someone to dig into your problem.
Here I guess the problem is the equator, where you can use \arc with different x- and y-radius.
\documentclass[border=5mm]{standalone}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\shade[ball color = gray!40, opacity = 0.4] (0,0) circle (2cm);
\draw (0,0) circle (2cm);
\draw (-2,0) arc (180:360:2 and 0.6);
\draw[dashed] (2,0) arc (0:180:2 and 0.6);
\fill[fill=black] (0,0) circle (1pt);
\draw[dashed] (0,0 ) -- node[above]{$r$} (2,0);
\end{tikzpicture}
\end{document}
