Rotation

1. Transformations:
Part Three: Rotation

2. Lesson Objectives
• To be able to Rotate a shape around a
given point

3. What 3 pieces of information do
you need to be able to rotate a
shape?

4. Rotate clockwise through 900

5. Rotate this shape clockwise through 90 0 about the point c.
90° clockwise
c

6. Rotate this shape anticlockwise through 1800 about the point c.
180° anticlockwise
c

7. Rotations
• A rotation turns a shape about a fixed point.
• This point is called the centre of rotation.
• You need three things to describe a rotation
1) the direction of the rotation (clockwise or anti-
clockwise)
2) the angle (900, 1800, 2700)
3) the centre of rotation (always give as a co-
ordinate)