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Introduction to rotation

Answer Text:
A transformation in which a plane figure turns around a fixed center point called center of rotation. A rotation in the anticlockwise direction is taken to be positive whereas a rotation in the clockwise direction is taken to be negative.
For example a rotation of `90^0` clockwise is taken to be negative. `- 90^0` while a rotation of anticlockwise `90^0` is taken to be `+90^0`.
For a rotation to be completely defined the center and the angle of rotation must be stated.