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Why, of course! A concave decagon.
What is the answer anyway?
Yet the stars cannot have all their internal angles equal to θ or to 360-θ...
There are stars
This was also my solution but it seems there is a polygon with fewer sides that meets the criteria.
I think it’s a concave dodecagon
I said concave, not convex. By "regular concave", I mean a concave polygon of which all the sides are equal and all its internal or external angles equal (that is, all the angles must be either θ or 360-θ).
I am sorry, I didnt notice 'Regular'.
Can you design it?
A concave quadrilateral.
What is the regular concave polygon with the smallest number of sides?