In two dimensions, a circle, ellipse. In fact any smooth closed curve.
Chat with our AI personalities
I believe the fewest number of sides in a planar, non-convex polygon is four.
A circle has an infinite number of sides.
A quadrilateral always has 4 sides... no more no less.
The shape with the fewest corners, ie the sphere.
There is no limit to the number of sides that a polygon can have. Mathematically, a circle is equivalent to a polygon with an infinite number of sides.