You are not currently logged in. Please create an account or log in to view the full course. Classic View Mathematics GCSE OCR OCR GCSE Mathematics (J560) – Higher 9. Congruence and Similarity Classic View Contents 9.04 Similarity 9.04 Similarity RATIO, PROPORTION, AND RATES OF CHANGE III – OCR GCSE (J560): HIGHER TIER Enlargement and Similar Shapes – 9.04b, 9.04c Dr Thomas Woolley, Cardiff University