rotation - Hutchinson encyclopedia article about rotation Printer Friendly
The Free Dictionary
1,155,213,596 visitors served.
?
Dictionary/
thesaurus
Medical
dictionary
Legal
dictionary
Financial
dictionary
Acronyms
 
Idioms
Encyclopedia
Wikipedia
encyclopedia
?

rotation

   Also found in: Dictionary/thesaurus, Medical, Financial, Acronyms, Encyclopedia, Wikipedia 0.01 sec.

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.



How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content.
?Page tools
Printer friendly
Cite / link
 Email
Feedback
?Sign in SSL protected
Email:
Password:
Register

? Mentioned in ? References in classic literature
 
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.
Anna Karenina by Tolstoy, Leo View in context
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.
From The Earth To The Moon by Verne, Jules View in context
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.
The Origin of Species by Darwin, Charles View in context
More results
 
Hutchinson browser? ? Full browser
 
 
Hutchinson Encyclopedia
?

Disclaimer | Privacy policy | Feedback | Copyright © 2008 Farlex, Inc.
All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. Terms of Use.