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It is a regular three-dimensional object.
A regular triangle is called an equilateral triangle. A regular quadrilateral is called a square. Did that help??? cone, sphere, cube, polyhedrons
Sphere
It is not irregular: it is simply the projection of a regular curve onto the surface of a sphere.
In 2D, there is the regular circle and the oval. In 3D, there is the sphere (I am not entirely certain this a considered a circle though).