2D and 3D Shapes

In two-dimensional shapes:

Sides are the straight lines that make a flat shape.

For example:

A corner is a point where two sides meet.

For example:

An angle is formed where two sides of a shape meet.

For example:

In three-dimensional shapes:

A face is a flat surface of a 3D shape.
 

An edge is where two faces of a 3D shape meet.

A vertex is where two or more edges of a 3D shape meet.

For example: