Which shape is a three-dimensional figure?

A three-dimensional figure has depth in addition to height and width, which sets it apart from two-dimensional shapes that only have height and width. The sphere is a prime example of a three-dimensional figure, as it occupies space in all three dimensions. It has a curved surface and can be defined by a radius, which is the distance from its center to any point on its surface.

On the other hand, the square, triangle, and rectangle are all two-dimensional shapes. They consist of only height and width, lacking depth. This distinction is crucial in identifying and classifying shapes based on their dimensions. Thus, understanding these properties helps to accurately categorize figures in geometry.