Clavius, Christoph
,
Geometria practica
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INDEX.
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## OCTAVI LIBRI
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## Propoſitiones.
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I. Figura regularis circulo circumſcripta maiorem ambitum habet, quam
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circul{us}. # 330
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LEMMA I. Si fuerint quatuor quantitates, & minor ſit exceſ-
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ſus inter primam & ſecundam, quam inter tertiam & quartam, ſit-
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que prima non minor, quam tertia, maior verò, quam ſecunda, itẽ
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tertia maior, quam quarta: Erit minor proportio primæ quantita-
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tis ad ſecundam, quam tertiæ ad quartam. # 331
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LEMMA II. Si circuli arcum duæ rectæ tangant, in vno pun-
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cto coeuntes, & in eodem arcu aptentur quotlibet rectæ æquales di-
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uidentes ipſum in partes totidem æquales: Erunt duæ illæ tangen-
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tes omnibus hiſce chordis ſimul maiores. # 332
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LEMMA III. Si circuli arcum tres rectæ tangant, in duobus
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punctis coeuntes, ita vt contactus punctum medium diuidat arcum
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bifariam, in eodem autem arcu accommodentur quotlibet rectæ
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numero pares, & inter ſe æquales; Erunt tres illæ tangentes omni-
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bus his ſimul ſumptis maiores. # 332
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CARDANI demonſtratio figuræ regularis circulo circum-
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ſcriptæ ambitum maiorem eſſe, quam circuliam bitum. # 333
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II. Circulorum diametri inter ſe ſunt, vt circumferentiæ Ex Pappo. # 334
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III. Arc{us} cuiuſuis circuli ad arcum ſimilem alteri{us} circuli eandem ha-
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bet proportionem, quam chorda adchordam. Et contra, arc{us} eandem habentes
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proportionem, quam chordæ, ſimiles ſunt. # 335
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IV. Dato quadrilatero æquale parallelogrammum in dato angulo, facili{us},
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quam per propoſ. 45. lib. 1. Eucl. conſtituere. # 336
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V. Dato Rectangulo ſupra datam rectam æquale rectangulum, facili{us},
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quam per propoſ. 45. lib. 1. Euclid. conſtituere. # 339
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VI. Dato rectilineo æquale rectangulum, facili{us}, quam per propoſ. 45. lib.
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1. Euclid. conſtituere. # 339
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VII. Si ex duob{us} punctis ad vnum punctum cuiuſuis lineæ rectæ quæ com-
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munis ſectio ſit plani per duo illa puncta ducti cum alio quopiam plano, duæ re-
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ctæ ducantur facientes cum illa duos angulos æquales: Erunt duæ hæ rectæ bre-
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uiores quibuſcunque alijs duab{us} rectis, quæ exijſdem duob{us} punctis ad aliud
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punctum ciuſdem lineæ rectæ ducuntur. # </
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