# Rotation

Rotation in math is one type of geometrical Transformation. It is used when a shape turns all its points through the same angle about a single point called the centre of rotation or origin.

The centre is the only point that does not move its position.

The diagram shows that the rectangle has rotated about the origin o by 90°.

Another way to look at this is to hold the center down with your finger and move the rectangle round.

This diagram has also been rotated about the origin o by 90°.

The origin is now away from the shape, therefore it is moving round the origin 0. (apologies, but the diagram is looking a bit dodgy)

Rotations can also be clockwise ☞ or anticlockwise ☜. In the second diagram the triangle has been rotated either 90° clockwise or 270° anticlockwise.

Related articles: Transformation, Translation, Enlargement, Reflection.

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