Regular and Irregular Polygons — Interactive Lesson (Year 4–5)

☆☆☆☆☆ Add your review • Year 4–5 • 🎓 Interactive Lesson & Activities

A 34-slide interactive Year 4–5 lesson identifying polygons, naming them by number of sides, and distinguishing regular from irregular polygons.

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Is a curved shape ever a polygon? This 34-slide interactive lesson teaches regular and irregular polygons, starting with what makes a shape a polygon at all.

Mastering Regular and Irregular Polygons in Year 4–5 Maths

Pupils learn to identify shapes that are and are not polygons, review different types of polygons by shape, name and side length, and distinguish between regular and irregular polygons. They learn that a polygon is a closed figure made of three or more straight sides without intersections, so a shape with curved sides or one that is not closed is not a polygon, then name polygons by their number of sides, from a triangle with three sides to a quadrilateral with four and a pentagon with five.

What’s Included

34-slide interactive lesson on regular and irregular polygons
Learning objectives on identifying, naming and comparing polygons
Clear rules for what makes a shape a polygon
Naming polygons by their number of sides
Drag-and-drop identification activities with instant feedback

Key Benefits for Students

Builds a precise definition of a polygon
Practises naming polygons systematically by side count
Distinguishes regular from irregular examples
Instant feedback on answer questions

Why Teachers Love It

No prep — ready for whole-class teaching on an interactive whiteboard
A long, structured lesson that can be split across sessions
Self-marking questions support independent practice
Suits teaching, revision and homework
A dependable foundation before angle properties of polygons

Love this? You’ll love…

A dependable addition to a Year 4–5 geometry topic, giving pupils a precise, rule-based way to identify and name polygons. This foundation supports later work on angle sums and properties of regular shapes.

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FAQs

What year group is this for?
Years 4–5 (ages 8–10), KS2.

Does it cover regular versus irregular polygons?
Yes — the distinction is a key learning objective.

Is it self-marking?
Yes, with instant feedback on the questions.

Year Groups	Year 4–5
Resource Type	🎓 Interactive Lesson & Activities
Format	Digital Only
Curriculum	England & Wales — KS2 (Years 4–5)
Added	4 March 2026