Three-Dimensional Shapes
Three-Dimensional Shapes
Definition Solid Geometry
Solid geometry studies three-dimensional shapes, such as cubes, cylinders, and spheres. The diagrams show examples of these shapes.
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Definition Surface
A surface is the exterior of a three-dimensional shape.
Definition Face
A face is a flat surface of a three-dimensional shape.
Definition Edge
An edge is a line segment where two faces meet.
Definition Vertex
A vertex is a point where two or more edges meet.
Example
Classification
Definition Classification
| Name | Shape | Faces | Edges | Vertices |
| Cube |  | 6 (flat) | 12 | 8 |
| Sphere | | 1 (curved) | 0 | 0 |
| Square Pyramid |  | 5 (flat) | 8 | 5 |
| Cylinder |  | 3 (1 curved, 2 flats) | 0 | 0 |