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2. Today we will be learning to: describe and visualise 2-D shapes classify polygons using criteria such as the number of right angles.

3. Mental Activity Visualise 2-D shapes.

4. Imagine a straight line in the air. Imagine it is bent, then bent again to make a triangle.

8. Can you make an enclosed shape by bending the line once?

9. Main Activity Investigating 2-D shapes.

11. Polygons Not polygons

12. Top Tip A polygon can have any number of sides greater than 3. It must be an enclosed shape. All its sides must be straight.

13. Square Equilateral triangle

14. What new shape is this? Count the number of sides. There are five, so it is a pentagon.

15. Two rectangles.

16. What shape is this? There are six sides, so it is a hexagon.

17. If the rectangles are arranged like this, what shape is it now? There are eight sides, so it is an octagon.

18. All the shapes we have made are polygons. They are all enclosed and have straight lines. This is not a polygon. It is not one enclosed area.

19. What other polygon names do you know? Do you know the name for shapes which have four sides? These include squares and rectangles.

20. Group Work Sort 2-D shapes into groups according to the number of sides. Make polygons. Make polygons with overlapping shapes.

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