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Racer Hi. (gramad)
Race Number 844
Date Fri, 27 Jan 2017 18:51:39 +0000
Speed 71 WPM Try to beat?
Accuracy 92.0%
Rank 4th place (out of 5)
Opponents cdarmy (2nd place) nejin (5th place) therealcan (3rd place)

Text typed:

In two dimensions we say that a rigid body has only one rotational degree of freedom, whereas in three dimensions we say that a rigid body has three rotational degrees of freedom. This might lead you to infer that in three dimensions you need to have three scalar quantities to represent a body's rotation. Indeed, this is the minimum requirement.
Physics for Game Developers (book) by David M Bourg (see stats)