# Polygons - Regular vs Irregular

### Related concepts

Names of polygons

- Trapezium
- Parallelograms

Symmetry

- What is a line of symmetry?
- How many lines of symmetry can you spot in a polygon?

Rotational Symmetry

- What is it?
- Why is it important? (Think how important it would be inside an engine.)
- Does the shape have rotational symmetry?

Angles

- Internal angles inside a polygon.
- Acute, Obtuse and Right angles.