A rotation is a transformation that turns a figure about a fixed point called the center of rotation..
• An object and its rotation are the same shape and size, but the figures may be turned in different directions.
• Rotations may be clockwise or counterclockwise.
Centre and Angle of Rotation
To obtain A', the image of A, we rotate OA about O through an angle of 90° anticlockwise. Similarly, to obtain B', the image of B, we rotate OB about O through an angle 90° anticlockwise. The image of the point C is obtained in a similar way. Such a transformation is called a rotation. In this example, point O is called the centre of rotation and angle 90° is called the angle of rotation.
OBSERVE THE ANIMATED FIGURE BELOW.
