Unlike two-dimensional (2-D) shapes, we touch and hold three-dimensional shapes in our environment everyday. These 3-D shapes are also called solid shapes or solids for short.

What is referred to as a side on a 2-D shape is called an edge on 3-D shapes. The point where these edges meet is called a vertex. A combination of 3 or more vertices will create a face. Each face is actually a 2-D shape, so when you look at 3-D shapes you will see a combination of squares, rectangles, triangles, etc.