## Sentence Examples

**Since****the****quadratic****moments****with****respect****to****w****and****of****are****equal**,**it****follows****that****w****is****a****plane**01**stationary****quadratic****moment****at****P**,**and****therefore****a****principal****plane****of****inertia****at****P**.**In****other****words**,**the****principal****axes**01**inertia****at****P****are****the****normals****to****the****three****confocals****of****the****systen**(3,~)**which****pass****through****P**.**Moreover****if****x**,**y**,**z****be****the****co-ordinates****of****P**, (33)**is****an****equation****to****find****the****corresponding****values****of**0;**and****if****Of**, 02, 03**be****the****roots****we****find****Oi**+O2+81r1a2$-7, (35)