A sphere has three, a circle has two, and a point has zero what?

Why this works

This riddle plays with the concept of dimensions in geometry. A sphere is a three-dimensional object, having length, width, and height, which accounts for its three dimensions. A circle is a two-dimensional shape, defined by its length and width, but lacking depth, hence it has two dimensions. Finally, a point is a zero-dimensional entity; it has no length, width, or height at all, representing zero dimensions. The clever progression through dimensionality makes this riddle both engaging and educational!