solid geometry
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Solid geometry is the study of shapes and figures that exist in three-dimensional space, such as spheres, cubes, and pyramids. It matters because it helps us understand and measure the properties of the physical objects around us, from buildings and containers to natural forms in the world.
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Hyperboloid of one sheet
Solid geometry or stereometry is the geometry of three-dimensional Euclidean space (3D space). A solid figure is the region of 3D space bounded by a two-dimensional closed surface; for example, a solid ball consists of a sphere and its interior.