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Solid Geometry

Solid Geometry is the geometry of three-dimensional space, the kind of space we live in ...

Three Dimensions

It is called three-dimensional, or 3D because there are three dimensions: width, depth and height.



There are two main types of solids, "Polyhedra", and "Non-Polyhedra":


A polyhedron is a solid made of flat surfaces. Each surface is a polygon. Examples:

Platonic Solids


Some solids have curved surfaces, or a mix of curved and flat surfaces (so they aren't polyhedra). Examples:

Sphere Torus
Cylinder Cone


Solids have properties (special things about them), such as:

  • volume (think of how much water it could hold)
  • surface area (think of the area you would have to paint)