Step 4 Objective
Recognise and visualise the transformation and symmetry of 2-D
shapes, including reflection in given mirror lines and line symmetry.
Construct 3-D models by linking given faces or edges.
- 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?
Ask pupils to describe what they see when given a diagram of an object, the mirror line and the image on squared paper. Start with vertical and horizontal mirror lines before extending to 45° diagonal lines. Encourage pupils to use the squares on the paper to measure distances between the mirror line, object and image.
Visually emphasise the importance of the line joining corresponding points on the object and image being perpendicular to the mirror line.
Also see TL4Y7: Shape, space and measures 4: S4.1, S4.2, S4.3 - Acrobat pdf document (48Kb).
Make nets using practical resources such as linking polygons before transferring to paper or cardboard.
Explore different types of cardboard packaging - Easter egg boxes are particularly interesting.
Ensure plenty of opportunities for visualisation (e.g. linking five or six squares together and justifying whether or not they will fold into a closed or open box; linking four equilateral triangles together and justifying whether they will fold into a regular tetrahedron).