DelMonte, Guidubaldo
,
In duos Archimedis aequeponderantium libros Paraphrasis : scholijs illustrata
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FDC. & ſi AD fuerit i
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pſi DC æqualis, conus
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ABC vocabit rectan
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gulus. </
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<
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ducto plano per axem,
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quod triangulum faciat
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ABC; erit angulus BAC
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ad coniverticem rectus:
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ſiquidem DAC recti di
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midius exiſtit, veluti
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DAB. pari ratione ſi ED
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fuerit ipſa DC minor;
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erit conus EBC obtuſi
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angulus:nam ducto per axem plano, habebit triangulum
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EBC angulum ad verticem coni BEC obtuſum; cùm ſit
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BEC maior BAC. exiſtenteautem FD ipſa DC maiori, co
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nus FBC acutiangulus nuncupabitur; quoniam
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per axem FBC angulum ad verticem coni F acutum poſſide
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bit; ſiquidem minor eſt BFC, quam BAC. Refert deinde,
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quòd vnum〈que〉mquè
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horum conorum
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modo piſci ſecue
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runt; vt ſit rectangu
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lus conus ABC; trian
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gulum verò per axem
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ſit ABC. in latere au
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tem AC quoduis ſu
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matur punctum D;
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ducaturquè DE ad
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AC perpendicularis;
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& per DE ducatur pla
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num plano ABC ere
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ctum, quod quidem conum ſecet, ſectio autem ſit FDG. quę
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ſanè eſt ſe ctio, quæ abipſis vocatur rectanguli coni ſectio,
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quippè quæ ſi intelligatur terminata recta linea FG, nuncupa
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tur portio recta linea, rectanguli〈que〉 coni ſectione contenta. </
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