Identifying 3D shapes from 2D shapes

In a nutshell

3D shapes are made up of vertices (corners), faces and edges. 3D shapes can be regular or irregular.

Regular 3D shapes

For regular 3D shapes, each face is the same shape, which is a regular polygon. Regular 3D shapes look the same from different sides. Below is a table of examples of regular 3D shapes:

SHape Name	Properties	Diagram
Cube	Each face is a square.
Regular tetrahedron	Each face is an equilateral triangle.

Irregular 3D shapes

For irregular 3D shapes, different faces can be different shapes. Irregular 3D shapes may look different from different sides. Below is a table of examples of irregular 3D shapes:

Shape Name	Properties	Diagram
Cuboid	Each face is a quadrilateral.
Cone	Has a circular base, and then comes to a point at the top.
Square-based pyramid	Has a square base and triangular sides meeting at a point.
Triangular prism	Has triangular faces at the ends and rectangular sides.