Rotation
Rotation turns a shape around a fixed point called the centre of rotation.
Rotation is an example of a transformation. A transformation is a way of changing the size or position of a shape.
Image caption, The shape has been rotated 90° (a quarter turn) clockwise about the centre of rotation
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The triangle PQR has been rotated 90° anticlockwise about the The point where the x-axis and the y-axis meet is the point O, which is called the origin. O to create the image P'Q'R'.
Example
Rotate the triangle PQR 90° anticlockwise about the origin.
Tracing paper can be used to rotate a shape.
Trace the shape and the centre of rotation.
Hold down the tracing paper with a pencil on the centre of rotation.
Rotate the tracing paper and copy the image.
Question
Describe the transformation of the rectangle ABCD.
Each corner of the image A'B'C'D' is the same distance from the origin as the original shape. The origin is the centre of rotation.
The rectangle ABCD has been rotated 180° about the origin (the direction is not required because it is a half turn).
