# instance [ ]

```
radius=norm[{x,y}];
linear = 3*x+2*y;

pts = instance [linear <= 3 and 0.5<=radius <=1 , 300];

//show pts;
pointplot pts;

save as cropped_anulus;
```

Ouput

[![instance_annulus.png](https://wiki.compclassnotes.com/uploads/images/gallery/2026-05/scaled-1680-/instance-annulus.png)](https://wiki.compclassnotes.com/uploads/images/gallery/2026-05/scaled-1680-/instance-annulus.png)