Clavius, Christoph
,
Geometria practica
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culari G I. </
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">Ducta namque recta D H, erit angulus DKE, maio@ angulo DLE.</
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">16. primi.</
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hoc eſt angulus GKI, angulo HLA. </
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<
s
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xml:space
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">Cum ergo recti I, A, æquales ſint; </
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<
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xml:space
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">15. primi.</
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reliquus G, reliquo AHL, minor. </
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<
s
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xml:space
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">Siigitur ipſi G, fiat æqualis AHM; </
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<
s
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">erunt trian-
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c
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xml:space
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">32. primi.</
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gula KGI, MHA, æquiangula; </
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<
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"> ideoque erit, vt MH, ad HA, ita KG, ad GI.</
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d
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xml:space
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">4. ſexti.</
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Et quia L H, maior eſt, quam M H, (quod angulus HML, maior ſit recto
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& </
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<
s
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xml:space
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">HLM, minor) erit maior proportio LH, ad HA, quam HM, ad HA,
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eſt, quam GK, ad GI: </
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<
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">ac proinde cum GK, HL, æquales ſint, erit quo que ma-
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">17. primi.</
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ior proportio HL, ad HA, quam HL, ad GI; </
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<
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"> ideo que HA, minor erit
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GI. </
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<
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">quod eſt propoſitum.</
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<
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</
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<
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proprietas eſt. </
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<
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">Quamuis Conchilis CF, nunquam conueniat cum
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recta EB, tamen cum qualibet alia recta, etiam ipſi EB, propinquiſsima conue-
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nit. </
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<
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">Sit enim primum recta NO, ipſi EB, parallela, ſecans EC, in O. </
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<
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">Fiatvt EO,
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ad OD, ita E C, ad P. </
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<
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">Et quoniam E O, minor eſt quam E C;</
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<
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erit
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">14. quinti.</
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OD, minor quam P. </
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<
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">Si igitur ex D, ad interuallum rectę P, deſcribatur arcus cir-
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culi, ſecabit is rectam ON, in aliquo puncto, vt in N. </
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<
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">Dico Conchilem CF, pro-
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longatam coire cum O N, in N. </
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<
s
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">Ducta enim recta D N, ſecante E B, in B, quæ
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ipſi P, æqualis erit; </
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<
s
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"> quoniam eſt vt EO, ad OD, ita BN, ad ND; </
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<
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">hoc eſt, ad
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">4. ſexti.</
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bi æqualem P. </
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">Fuit autem etiam, vt EO, ad OD, ita EC,
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ad P. </
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">Igitur BN, EC,
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ad P, eandem proportionem habebunt: </
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<
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"> ac proinde inter ſe æquales erunt;</
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<
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">9. quinti.</
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ideoque Conchilis per N, tranſibit.</
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<
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<
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deinde recta Q F, non parallela ipſi E B, ſed eam ſecet in E, vergatque
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verſus Conchilem. </
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<
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">Quia igitur Conchilis cum recta ON, conuenit, conueniet
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prius cum ipſa QF, in F, vt perſpicuum eſt.</
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<
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<
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hæc Nicomedes diſſoluit huiuſmodi problema. </
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lo rectilineo, & </
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<
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">Ab
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illo puncto educere rectam ſecantem rectas datum continentes angulum, ita vt
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eius portio inter illas rectas intercepta æqualis ſit datæ rectę. </
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<
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">In eadem nam-
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que figura rectæ EB, EF, angulum contineant BEF, ducendaque ſit ex D, linea,
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ita vt eius portio inter E B, E F, æqualis ſit datæ rectæ, R. </
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<
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">Ex O, ad inferiorem
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lineam E B, ducatur perpendicularis DE, ſumatur que EC, datæ rectæ R, æqua-
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lis: </
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<
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">& </
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<
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">polo D, interuallo verò EG, Conchilis deſcribatur, quæ per ſecun-
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dam proprietatem rectam E F, ſecabit in F. </
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<
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xml:space
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">Ducta ergo recta D F, ſecante
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E B, in S; </
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<
s
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">erit S F, ipſi EC, hoc eſt, ipſi R, æqualis, vt ex deſcriptione Conchi-
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lis liquet.</
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<
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præmiſsis, ſint duæ rectæ AB BC, ad angulum rectum B, coniunctæ, in-
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ter quas reperiendæ ſint duę lineæ medię proportionales. </
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<
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gulum AC, cuius duo latera A D, CD, bifariam ſecentur in F, E. </
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<
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">Ducta autem
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ex B, per E, recta ſecante A D, productam in G; </
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<
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"> erit DG, ipſi CB, hoc eſt,
<
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">26. primi.</
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D A, æqualis; </
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<
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">propterea quod anguli D, E, trianguli D E G, angulis CE, trian-
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guli CEB, æquales ſunt, & </
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<
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">latera quoque DE, CE, quibus adiacent, æqualia.
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</
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<
s
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">Rurſus ductam perpendicularem FH, ſecet AH, ipſi CE, æqualis, quod fiet, ſi ex
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A, ad interuallum C E, arcus delineetur ſecans F H, in H. </
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<
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">Deinde iuncta recta
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GH, ducatur ei parallela AI: </
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<
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<
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">producta DA; </
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<
s
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">ex H, per problema præcedens,
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ducatur recta HK, vtramque AI, AK, ita ſecans, vt inter cepta IK, ipſi AH, vel
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CE, æqualis ſit. </
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<
s
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">quod fiet, ſi ex H, plurimæ rectæ ducentur occultæ, donec v-
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nius portio inter cepta æqualis ſit ipſi AH, vel CE. </
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<
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