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Well, a 2D object has only length and width, but a 3D object has length, width, and depth.
Ah, what a lovely question. When you cut through a 3D object, you create a new shape called a cross-section. It's like peeking inside a beautiful box to discover a hidden treasure waiting to be revealed. Just imagine the possibilities that unfold when you explore the world of cross-sections!
Paper is a 3D object.
A sphere.
A Heptagon is a 3d object with 7 faces. An example of a heptagon is a hexagonal pyramid (that is a pyramid with a hexagon for the base).