DelMonte, Guidubaldo
,
In duos Archimedis aequeponderantium libros Paraphrasis : scholijs illustrata
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ſeſquitertias eſſe triangulorum, erit igitur magnitudinis ex vtriſ〈que〉 por-
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tionibus A
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k
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B BLC compoſitæ centrum grauitatis punctum
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magni
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tudinis verò ex vtriſ〈que〉 triangulis AKB BLC compoſitæ punctum
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T. Rurſus ita〈que〉 quoniam trianguli ABC centrum grauitatis eſt
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E, magnitudinis verò ex vtriſ〈que〉 A
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k
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B BLC portionibus punctum
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manifestum eſt totius portionis A
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B
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C centrum grauitatis eſſe in linea
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QE ita diuiſa
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in O puncto,
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vt quam proportionem habet trian
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gulum ABC ad vtraſ〈que〉 portiones A
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k
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B BLC, eandem habeat por
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tio ipſius terminum habens punctum Q,
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hoc eſt OQ
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ad portionem
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minorem
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OE.
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pentagoni autem AKBLC,
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hoc eſt magnitudinis
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ex triangulo ABC, trianguliſquè AKB BLC compoſitæ
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centrum grauitatis eſt in linea ET ſic diuiſa
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in S,
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vt quam habet
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proportionem triangulum ABC ad triangula AKB BLC, eande ha
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beat portio ipſius ad T terminata,
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hoc eſt ST
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ad reliquam
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SE.
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Quoniam igitur maiorem habet proportionem triangulum ABC ad
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triã
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gula KAB LBC, quam ad portiones
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AKB BLC; minora enim
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ſunt triangula portionibus. </
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<
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miorẽ
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pro
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portio nem, quam QO ad OE ac propterea erit
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punctũ
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S
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propinquiusipſi E, quàm O. Nam ſi punctum S primùm
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eſſet in eodem puncto O, tunc TO ad OE, non quidem
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maiorem, ſed minorem haberet proportionem, quàm
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ad OE, cùm ſit TO minor QO. ſimiliter ob eadem cau
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ſam ſi punctum S eſſet inter OT, minorem
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pro
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portionem TS ad SE, quàm QS ad SE, quare & ad huc
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maiorem haberet proportionem QO ad OE, quàm TS
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ad SE. neceſſe eſt igitur punctum S eſſe inter puncta OE.
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Itaquè cùm punctum O ſit
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centrũ
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grauitatis portionis ABC,
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punctum verò S centrum ſit grauitatis rectilineæ figuræ
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AK BLC;
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constat portionis ABC centrum grauitatis propinquius
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eſſe vertici B, quàm centrum rectilineæ figuræ inſcriptæ. </
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<
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nibus rectilineis figuris in portionibus planè inſcriptis eadem eſt ratio.
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quod demonſtrare oportebat. </
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