What is a vertex?

A vertex is a point where lines or edges meet, in other words a corner. Flat shapes have vertices where their sides meet, and solid shapes have vertices where their edges meet. The plural of vertex is vertices.

Examples

• A triangle has 3 vertices.
• A square has 4 vertices.
• A cube has 8 vertices.

Quick facts

• In a 2D shape, the number of vertices equals the number of sides.
• A vertex is also where the two rays of an angle meet.