Clavius, Christoph
,
Geometria practica
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GEOME. PRACT. LIB. OCTAVVS.
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cando radicis inuentæ quadratum ex eadem tabula excerptum, nimirum 25921.
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</
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<
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<
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<
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xml:space
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">per quem ſi meum punctum diuido, reperio Quotiẽ-
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tem 9. </
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<
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<
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xml:space
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<
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xml:space
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">adeo vt vltimum punctum ſit
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7295302307</
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<
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<
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<
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paro nouum diuiſorem, multiplicando radicis 1619. </
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<
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quadratum 2621161. </
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<
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<
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<
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xml:space
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">per quem ſi vltimum meum
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punctum diuido, inuenio Quotientem 9. </
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<
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xml:space
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">Facta autem operatione, remanent
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214232708. </
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<
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<
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<
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vero negligendum videtur non inutile compendium in extractio-
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ne cubica. </
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<
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<
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xml:space
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">Quando nouus diuiſor parandus eſt, ne coga-
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mur totius radicis inuentæ quadratum ſupputare, diuidemus radicem inuentam
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in duas partes, ita vt vna pars ſit vltima figura Quotientis inuenta, nimirum in-
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uenta quarta figura 9. </
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<
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1610. </
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<
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<
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xml:space
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">quas partes bis ſcribemus, vt in appoſita formula
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vides. </
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<
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xml:space
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">Si igitur ſingulas partes in ſingulas partes ducemus,
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1610. # 9.
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1610. # 9.
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producetur quadratus quæſitus radicis 1619. </
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<
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">Verbi gratia quia præcedens
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quadratum numeri 161. </
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<
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<
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">appoſitis duabus cifris, habebimus produ-
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ctum 2592100. </
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<
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<
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productum ex 1610. </
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conficiemus 2621161. </
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<
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<
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xml:space
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">Eadem ratione ſi huius
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numeri 16199. </
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<
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hac formula vides. </
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2621161. </
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<
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16190. # 9.
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16190. # 9.
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2116100. </
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<
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<
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</
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<
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<
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inſuper 81 productum ex 9. </
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<
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<
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<
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99. </
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<
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<
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<
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xml:space
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">Hoc ergo compendium reddet faciliorem cubicæ radicis
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extractionem, cum ſemper præcedentis radicis inuentæ quadratum habeamus,
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& </
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<
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vna cifra, &</
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<
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autem vides, ſi tabula ſuperior extenderetur, vt haberentur quadra-
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@i, & </
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<
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dicum. </
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<
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ti fuimus tabula, in quaradices habent 3. </
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<
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mum, cum eã quilibet ex ijs, quæ diximus,
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extendere poſsit, & </
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