Transformations, symmetry, similar triangles, enlargement and reduction

What this note covers

1. Congruent versus similar: the distinction the whole topic rests on
2. The three transformations that preserve size
3. Symmetry in designs, logos and objects
4. Angle properties you will need alongside similarity
5. Similar triangles: recognising them and using them
6. Enlargement, reduction and the effect on length, area and volume
7. Worked example: finding a height you cannot reach
8. How this topic is examined and what separates a top-band answer

8 sections · 12 key terms & formulas · 6 common mistakes