## Sentence Examples

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**Three-dimensional****Kinematics****of****a****Rigid****Body**.**The****position****of****a****rigid****body****is****determined****when****we****know****the****positions****of****three****points****A**,**B**,**C****of****it****which****are****not****colljnear**,**for****the****position****of****any****other****point****P****is****then****determined****by****the****three****distances****PA**,**PB**,**PC**.**The****nine****co-ordinates**(**Cartesian****or****other**)**of****A**,**B**,**C****are****subject****to****the****three****relations****which****express****the****invariability****of****the****distances****BC**,**CA**,**AB**,**and****are****therefote****equivalent****to****six****independent****quantities**.