Vitruvius
,
De architectura libri decem
,
1567
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quo ſolida conduplicari, & </
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">multiplicari poſsint, ut uſus organorum ac demonſtrationu nobis facile innoteſcat.
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<
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">Ac primum ad datum ſolidum ſub data proportione aliud conſtituere demonstrabo. </
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<
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">Esto igitur propoſitum
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ſolidum a, uolo aliud ſolidum constituere, quod cum præ dicto eam habeat proportionem, quam habet li-
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nea b, ad lineam c. </
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<
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">ſumatur igitur linea æqualis alicui lateri ex bis, quæ babet ſolidum c, & </
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<
description
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b f b d</
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number
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<
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xml:space
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p b e f k d</
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</
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fig-514.01.311-03
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Eratoſtbenis cum
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inſtrumento.</
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<
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">Inſtrumentum Platonis.</
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</
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<
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<
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<
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s e</
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<
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Platonis.</
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d, & </
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ad ipſam comparetur, & </
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<
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">iuxta præ cedentium aliquam dem onſtrationum inter rectas d, & </
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<
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">e, duæ inuenian-
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tur mediæ comparabiles, & </
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<
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">e, ſint continua proportione inuicem
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reſpondentes. </
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<
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">inde ex aliqua recta æ quali ipſi f, per uigeſimam ſeptimam libri undecimi ſiat ſolidum, quod
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ſit b, & </
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<
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">ſimiliter poſitum ſolido a, quoniam per trigeſimam tertiam eiuſdem,ſi quatuor lineæ erunt pro-
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<
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