How do you make a circle using Gimp?

Answer 1

If you want to make a circle that is 2 pixels wide:

1. Use the ellipse marking tool on a new layer (transparent) and hold the Shift or Ctrl key (or both) to get the outside edge of circle you want.
2. Fill the circle with the color of your choice
3. Use the select >Shrink option to make the selection smaller by 2 pixels
4. Delete the interior of the circle
5. You are left with a ring 2 pixels wide on that layer

Answer 2

Using Ellipse tool to draw shape or Elliptical Marquee tool to select area (also can be converted to path then to shape).