Step 2 Objective
Classify polygons, using criteria such as number of right angles, whether or not they are regular, and symmetry properties.
- Examples of what pupils should
know and be able to do - Probing questions
- What if pupils find
this a barrier?
What if pupils find this a barrier?
Use classifying activities, for example:
Give pupils a set of regular and irregular polygons, and criteria for classifying them written on cards, such as 'Regular polygons'; 'Irregular polygons'; 'No lines of symmetry', 'One line of symmetry', etc.; 'No right angles', 'One right angle', etc. Set challenges, such as to find polygons that are irregular with one right angle. Give blank cards for pupils to draw polygons for given criteria. Identifying right angles may need the use of a template from a folded piece of paper, or work on a right angle being a quarter of a turn.
Emphasise the difference between regular and irregular polygons, and different orientations of shapes.