A polygon is a **flat, 2D shape. **

It has **straight sides **and is **fully closed.**

All of the sides are **straight** and **joined up.**

Polygons can have **any number of sides.**

**Regular polygons:**

A **regular polygon** has all sides of the **same length and all sides at the same angle**.

**An equilateral triangle is a regular polygon; all of its sides and angles are the same.**

**Irregular polygons:**

An **irregular polygon** is a shape with** sides and/or angles at differing lengths and sizes.**

A scalene triangle has differing angles and sides.