Drawing Circles

I was drawing circles and it just changed to triangles, Anyone have any ideas why and how I can fix it?

It would seem that you inadvertently changed the default number of sides for circles from 24 to 3. You can change the default to any number you wish, although the standard 24 sides is a good choice without a specific reason for using more or fewer. You can also change the number of sides for individual existing circles.

See this article for more information: SketchUp Circle Tool: Creating precise circles


Thank you , that worked.