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# transformations: part three: rotation - PowerPoint PPT Presentation

Transformations: Part Three: Rotation. Lesson Objectives. To be able to Rotate a shape around a given point. What 3 pieces of information do you need to be able to rotate a shape?. Rotate clockwise through 90 0. Rotate this shape clockwise through 90 0 about the point c . c.

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### Transformations:Part Three: Rotation

• To be able to Rotate a shape around a given point

Rotate rotate a shape?clockwise through 900

Rotate this shape rotate a shape?clockwise through 90 0 about the point c.

c

90° clockwise

Rotate this shape anticlockwise through 180 rotate a shape?0 about the point c.

c

180° anticlockwise

Rotations rotate a shape?

• A rotationturns 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)