1

This question already has an answer here:

Draw a sphere with radius with TikZ. According to the figure

enter image description here

marked as duplicate by gernot, user36296, Stefan Pinnow, Zarko, user13907 Jan 13 '17 at 23:03

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

16

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}

enter image description here

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