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rotation

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rotation

In geometry, a transformation in which a figure is turned about a given point, known as the centre of rotation. A rotation of 180° is known as a half turn.

Three things are needed to describe a rotation: the angle of rotation, the direction of rotation (clockwise or anticlockwise), and the centre of rotation.

For example, in the diagram, triangle A is mapped onto triangle B by a rotation of 90° clockwise with centre (0,0):

The inverse transformation is the rotation of B back onto A. When a shape is rotated but appears not to have moved it is said to have rotational symmetry. Translation, reflection, and enlargement can also transform shapes.



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But looking at the movements of the stars, I can't picture to myself the rotation of the earth, and I'm right in saying that the stars move.
By attentively watching, the observer would then have perceived the other molecules of the mass, following the example of this central star, become likewise condensed by gradually accelerated rotation, and gravitating round it in the shape of innumerable stars.
Farmers find that they can raise most food by a rotation of plants belonging to the most different orders: nature follows what may be called a simultaneous rotation.
 
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