Clavius, Christoph
,
Geometria practica
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GEOMETR. PRACT.
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altera D, contentum, cubo rectæ E, æquale eſſe. </
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xml:space
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ſexti.</
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rectæ A, ad quadratum rectæ E proportionem habet, quam A, ad F, id eſt, quam
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E, ad D, recipro cabuntur baſes cum altitudinibus, cum baſis parallelepipedi
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ſit quadratum rectæ A, & </
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<
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<
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tum rectæ E, & </
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<
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<
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cimi.</
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dum, & </
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<
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<
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D, & </
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<
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ſexti.</
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quadratum rectæ D, ad quadratum rectæ F, id eſt, vt baſis dicti parallelepipe-
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di ad baſem dicti cubi, ita D, ad E, hoc eſt, ita F, ad A, hoc eſt, ita altitudo cubi,
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ad altitudinem parallelepipedi; </
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<
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nibus: </
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<
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xml:space
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<
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cimi.</
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propoſitum.</
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<
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verò in noſtra Arithmetica practica ſolum radicis quadratæ extra-
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ctionem explicauimus, operæ me pretium facturum puto, radicis cubicæ extra-
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ctionem hoc loco, quamuis fortaſſe alieno, inſerere: </
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ſaria omninò eſt, vt problema hoc 13. </
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<
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xml:space
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">Hoc autem ef-
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ficiam, ſi præſcribam artem quandam generalem, qua cuiuſcunque generis ra-
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dicem extrahere poſsimus, ex libro eximij cuiuſdam Arithmetici Germani de-
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promptam fermè totam: </
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">quod quidem ſtudioſo Lectorinon iniucundum, aut
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ingratum fore confido.</
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<
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radicis eſt inuentio numeri ex propoſito numero, qui mul-
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dicis quid.</
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tiplicatione aliqua in ſe numerum propoſitum producat. </
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dratæ radicis eſt inuentio numeri ex numero quadrato, qui quadratè mul-
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tiplicatus ipſum producat: </
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<
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">Et extractio radicis cubicæ, eſt inuentio nume-
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ri, qui in ſe ductus cubicè producat cubum propoſitum, &</
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ſit multiplicare numerum quadratè, aut cubicè, aut alio modo, mox expli-
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cabo.</
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<
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igitur infinitæ ſunt ſpecies multiplicationum nume-
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ci{es}
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radicum.</
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rorumin ſe, vt ſtatim dicam, ex quibus oriuntur numeri quadrati; </
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cubi, Zenficenſi, Surdeſolidi, &</
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plicari ſolent: </
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appellationes, qui conſurgunt ex varia radicum multiplicatione. </
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pulchrè nobis repræſentat naturalis numerorum progreſsio, inſeruiens
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progreſsionibus Geometricis ab vnitate incipienti-
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bus: </
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