Rotation

On a coordinate grid

For a Rotation, you need

• An angle or fraction of a turn– Eg 90° or a Quarter Turn– Eg 180° or a Half Turn

• A direction– Clockwise– Anticlockwise

• A Centre of Rotation– A point around which the Object rotates

y

x 1 2 3 4 5 6 7 8

1

2

3

4

5

6

7

8

–7 –6 –5 –4 –3 –2 –1 -1-2-3-4-5-6

A Rotation of 90° Anticlockwise about (0,0)

xxxxx

y

x 1 2 3 4 5 6 7 8

1

2

3

4

5

6

7

8

–7 –6 –5 –4 –3 –2 –1 -1-2-3-4-5-6

A Rotation of 180° about (0,0)

xxxxx

xxx