Students learn how about the difference between similar and congruent shapes. Learning progresses from proving congruency and similarity to using different scale factors to calculate an unknown length, area or volume. This unit takes place in Term 2 of Year 10 and follows on from transformations.
My experience as a Head of Mathematics going through the deep dive OFSTED inspection.
How to use ratios and proportional reasoning as a model for finding the original amount after a percentage change.
To find the area of compound shapes students need to understand what the word compound means.