Thank you for your answer.
In the following code:

```
\begin{tikzpicture}
 \path[use as bounding box] (-1.8,-1.8) rectangle (1.8,1.8);
 \draw[clip] plot[smooth cycle,variable=\t,samples at={0,45,...,315}] (\t:{1.5*(1+0.1*rnd)});
 \foreach \X [count=\Y starting from 0] in {red,blue,green!70!black}
 {\draw[\X] plot[smooth,variable=\t,samples at={0,0.25,...,1.75}] 
 ({15+6*(rnd-0.5)+120*\Y}:\t);
 }
\end{tikzpicture}

```

1. How to change the center and radius of the circle?
2. How to change the status of radius of the circle?
[![enter image description here](https://i.stack.imgur.com/qvC82.jpg)](https://i.stack.imgur.com/qvC82.jpg)