**What are Polygons? Types of polygons**

### What are Polygons. Types of polygons

A polygon is a closed plane figure with straight

sides. like triangles and squares.

Polygons are 2-dimensional shapes. They are made

of line segments (straight lines), and the shape is

closed.

The Vertex is endpoint where the two sides meet.

**These figures are examples of polygons**

**These figures are examples of non-polygons**

**Simple or Complex**

A polygon is simple if it is described by a single,

non-intersecting boundary; otherwise it is said to be

complex.

**Regular or Irregular**

A polygon is called regular if all its sides are of equal

length and all its angles are equal. Otherwise it is

irregular.

**Concave or Convex**

Polygons can be Convex meaning all angles (vertex) are facing out like

most of the Polygons above. Are they could be concave or non-convex

Polygons with one or more angles (vertex) pointing in. Like the one to the

right.

Triangles and squares are two examples of Regular Convex Polygons

**Names of Polygons**

Polygons can be named by how many sides they have,

starting from the Triangle which has three sides.