Transformations and enlargements

Transformations and enlargements

1. Translation (1) is when a point or shape is moved in a straight line, shape and orientation of object not changed

2. Central symmetry through a point (2), image upside down and facing object

3. Centre of symmetry (3) when an object is mapped onto itself under a central symmetry

4. Axial symmetry (4), object reflected in a line, mirror image

5. Enlargement (5) size and position of shape changes

   • Need centre of enlargement and scale factor - construction steps (6)
   • properties of enlargements (7) corresponding sides are in the same ratio, areas are in ratio of scale factor squared