|Solid Geometry is the geometry of three-dimensional space,
the kind of space we live in ...
It is called three-dimensional, or 3D because there are three dimensions: width, depth and height.
Let us start with some of the simplest shapes:
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)
- how many vertices (corner points), faces and edges they have
Polyhedra and Non-Polyhedra
There are two main types of solids, "Polyhedra", and "Non-Polyhedra":
(they must have flat faces)
(if any surface is not flat)