The LessonA rotation turns a shape. A rotation is a turn of a shape about a point (called the centre of rotation). A translation is a type of transformation.
A Real Example of a RotationIt is easier to understand rotation with an example. The diagram below shows a rotation of a shape. The shape before the rotation (called the object) is in light blue. The shape after the rotation (called the image) is in dark blue:
In this example, the shape has rotated around a centre of rotation (shown as a red cross) at the origin.
Properties of a Rotation
All points move in a circle around the centre of rotation.
- Each point in the image is the same distance from the centre of rotation as the object.
- The image is the same size as the object.