Edexcel IGCSE Maths 复习笔记 5.4.1 Transformations - Enlargement

Enlargement – what do I need to know?

• You need to be able to perform an enlargement (on a coordinate grid) as well as spotting and describing an enlargement when presented with one.
• The key things with an enlargement are:
  • Scale FactorThe scale factor is how many times every side of the image is bigger than the objectHowever if the scale factor is a fraction the image will be smaller than the object
  • Centre of EnlargementThis tells us where on the page the image is going to go but we have a bit of work to do firstAs with the other transformations in most cases it is easiest to move one vertex of the shape and draw the image from there