The form of an object, how it is laid out in space (not what it is made of, or where it is).
Common two dimensional (2D) shapes are: Circles, squares, triangles, etc
Common three dimensional (3D) shapes are: Spheres, cubes, pyramids, etc
Common two dimensional (2D) shapes are: Circles, squares, triangles, etc
Common three dimensional (3D) shapes are: Spheres, cubes, pyramids, etc
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