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Record your races with a typeracer account:

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Racer THEPANDAISREAL (lapsapkia)
Race Number 13
Date Sat, 4 Feb 2017 06:56:51 +0000
Speed 45 WPM Try to beat?
Accuracy 95.6%
Rank 4th place (out of 4)
Opponents mr_tofu (1st place) squidbob (2nd 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)