Thank you everyone! With your help I have also tried the following:
Created a rectangle and duplicating it twice.
Snapped them together to create a larger rectangle.
Filled each small rectangle with a different colour.
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Add+ (pressed for a bit longer than a quick tap). This made a Compound group.
Created a circle and dragged it over the stripes. Snapped it to the top and bottom stripe borders.
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Tapped "Intersect".
Voila....circular flag. ; )
Oh_Brother got a reaction from William Overington in Simple Circular Flag with 3 Horizontal Stripes.