Clavius, Christoph
,
Geometria practica
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GEOMETR. PRACT.
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æquali ipſi DE) vt SB, ad DE, ita AD, ad DH. </
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<
s
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xml:space
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"> Quia vero plana parallela
<
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">17. vnde.</
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DEF, ſecant rectas AH, GH, proportionaliter in I, G; </
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<
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">erit quoque vt SB, ad
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DE, ita GI, ad IH. </
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<
s
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">Siigitur fiat, vt SB, differentia inter latera homologa AB,
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DE, baſium ad DE, ita GI, altitudo Fruſti pyramidis (quæ cognoſcetur per li-
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neam perpendicularem demiſſam ad baſem ex aliquo puncto plani DEF, et-
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iam producti, ſi opus eſt,) ad aliud, prodibit recta IH, altitudo nimirum pyra-
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midis DEFH: </
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<
s
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xml:space
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">qua addita ad GI, tota altitudo GH, cognita erit. </
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<
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">Area fruſti
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pyramidis.</
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caput præcedens inueniatur area tam integræ pyramidis ABCH, quam abſciſ-
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ſæ pyramidis D E F H, & </
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<
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">hęc ab illa dematur, reliquum fiet Fruſtum
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A B C D E F.</
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<
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<
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aliter fruſtum Coni ABCD, inueſtigabitur, vt patet, ſi integer Co-
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coni.</
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nus intelligatur ABH, &</
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<
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modo idem fruſtum tam Pyramidis, quam Coni cognoſcemus,
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etiamſi neque pyramis, neque conus integretur. </
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<
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xml:space
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"> Fiant quadrata K L M N, NOPQ, baſibus ABC, DEF, notis æqualia, inueniaturque inter quadrata KM,
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NP, ſuperficies media proportionalis, qua-
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http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/xxxxxxxx/figures/238-01
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lis eſt rectangula figura OK, producto la-
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tere O P, ad R. </
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MN, ad NO, ita KM, ad NR. </
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ad NQ, ita NR, ad NP. </
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<
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xml:space
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"> eſtque M N,
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NO, vt KN, ad N Q: </
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<
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">erit quadratum K M,
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ad rectangulum NR, vt rectangulum N R,
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ad quadratum N P: </
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<
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">ideoque N R, medio
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loco proportionale eſt inter quadrata
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KM, NP. </
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">Quamobrem, ſi radix quadrata
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baſis ABC, notæ, id eſt, latus KN, quadrati KM, ducatur in radicem quadratam
<
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baſis DEF, notę, hoc eſt, in latus NO, quadrati N P, producetur area rectangu-
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li N R.</
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vero ducatur GI, altitudo fruſti in ſummam ex quadrato KM, hoc eſt,
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ex baſe ABC, & </
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<
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">quadrato NP, ſiue baſe DEF, & </
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tionali inter baſes, vel dicta quadrata collectam. </
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<
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">Productus enim numerus
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triplus erit fruſti pyramidis A B C D E F; </
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">ideoque tertia producti pars area erit
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prædicti fruſti. </
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<
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"> Quoniam enim priſma, quod fit ex GH, altitudine
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in baſem ABC, ſiue quadratum KM, triplum eſt pyramidis ABCDEFH: </
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<
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">erit
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quoque parallelepipedum factum ex GI, in quadratum KM, vna cum paralle-
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lepipedo facto ex IH, in idem quadratum KM, triplum pyramidis eiuſdem. </
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<
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<
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aũt & </
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<
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">ablatum parallelepipedum factum ex IH, in baſem DEF, hoc eſt, in qua-
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dratum NP, triplum ablatæ pyramidis DEFH, Igitur & </
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<
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">reliquum, quod fit
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">5. quinti.</
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GI, in quadratum KM, vna cum iis, quæfiunt ex IH, in KP, & </
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<
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">in RM, triplum
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erit fruſti reliqui ABCDEF.</
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<
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<
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verò æquales ſuperficies A B C, K M, ad ſuperficies
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">7. quinti.</
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DEF, NR, eandem habent proportionem, erit permutando ABC, ad DEF, vt
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KM, ad NP. </
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<
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"> ideoque latus AB, ad latus DE, erit, vt latus KN, ad latus NQ, &</
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<
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<
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xml:space
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">22. ſexti.</
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diuidendo (ſubtracta recta AS, æquali ipſi DE, ex AB,) SB, ad DE, vt KQ, ad
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QN. </
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<
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<
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<
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">demonſtrauimus, vt SB, ad DE, ita GI, ad IH. </
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tur erit etiam vt KQ, ad QN, ideoque vt MO, ad ON, ita GI, ad IH. </
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<
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"> Sed vt KQ, ad QN, ita eſt KP, ad PN: </
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<
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">Et vt MO, ad ON, ita MR, ad RN. </
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<
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">Igitur erit
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<
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