# Regular

All angles are equal and all sides are equal – everything equal.

**Regular**ly every day she measured the length of her plant. It was always the **same**.

**NOTE:**

Regular polygon – all angles are equal and all sides are equal on this many-sided shape.

An irregular polygon is the opposite, i.e. not regular.

**Example 1**

Each internal angle between the sides of an equilateral triangle is 60° and each side is equal. This can also be described as a regular triangle.

**Example 2**

Each internal angle between the sides of a square is 90°. This shape has equal sides and is a regular polygon.

**Example 3**

The internal angle between the sides of a regular pentagon is 108°.

**Example 4**

The internal angle between the sides of a regular hexagon is 120°.

**Example 5**

The internal angle between the sides of a regular heptagon is 128°.

**Example 6**

The internal angle between the sides of a regular octagon is 135°.