Stevin, Simon
,
Mathematicorum hypomnematum... : T. 4: De Statica : cum appendice et additamentis
,
1605
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DE INVENIENDO GRAVITATIS CENTRO.
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<
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<
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xml:space
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">Ab angulo B, trianguli A B C recta ducatur in D, medium
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punctum oppoſiti lateris, conſimiliter & </
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<
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">à C recta in E punctum medium la-
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teris A B, ſecans B D in F, gravitatis centro trianguli A B C.</
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<
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s
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xml:space
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"> Subductâ ratione E B 1 ad B A 2, de
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"> Per inver-
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ſionĕ cap. 12.
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Almag. Pto-
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lem.</
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D C 1 ad D A 1 (id eſt ratione {1/2} de ratione {1/1})
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C F ad FE reliqua eſt. </
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<
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">Atqui ratione {1/2} ſubductâ
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de ratione {1/1} relinquitur ratio {2/1}. </
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<
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eſt, ut 2 ad 1. </
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centrum in triangulo ita ſecat rectam ab angulo in
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medium oppoſiti lateris, ut ſegmentũ inter ipſum
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& </
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<
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">angulum ad reliquum duplum ſit, quod fuit demonſtrandum.</
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lia ſegmenta partito: </
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">recta per ſectionum puncta tertio la-
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teri proxima, pergravitatis centrum eſt ducta.</
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lia ſegmenta ſecta ſunto, illud punctis D, E, iſtud vero F, G. </
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tio lateri B C proxima, recta E G ſit ducta.</
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">E G per trianguli A B C gravitatis centrum eſſe, demon-
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ſtrandum eſt. </
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ſecans E G in I.</
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"> Quandoquidem ratio A E ad E B, eſt ratio A G ad G C recta E G
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">1. prop. 62
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lib. Eucl.</
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rectam B C parallela erit, item E I ad B H. </
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dum igitur A E ad E B: </
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">ita A I ad I H, atqui A E ad E B
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ex conceſſo, eſt dupla; </
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vero A I dupla eſt ad I H, I gravitatis centrum eſt triangu-
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li A BC per 4 propoſit. </
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eſt ducta. </
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terum unoquoque in tria æqualia ſegmenta partito: </
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perſectionum puncta tertio lateri proxima, per gravitatis
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centrum eſt ducta.</
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