Clavius, Christoph
,
Geometria practica
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INDEX.
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XVIII. Secta linea recta vtcunque, adiungere ei verſ{us} vtramuis partem
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lineam rectam, ita vt quadratum toti{us} rectæ compoſitæ æquale ſit quadrato re-
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ctæ adiunctæ, vnà cum quadrato rectæ, quæ ex adiuncta, & proximo ſegmen-
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to prioris lineæ conflatur. # 351
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XIX. Datis duab{us} rectis inæqualib{us}, quarum maior diametrum qua-
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drati ex minore deſcriptinon ſuperat: Maiorem ita ſecare in du{as} partes in-
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æquales, vt earum quadrata ſimul ſumpta quadrato minoris lineæ ſint æqualia.
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# 352
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XX. Data chorda alicui{us} arc{us}, vnà cum perpendiculari, quæ ex medio
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puncto chordæ ad arcum vſque educitur: Quot grad{us}, vel palmos tam arc{us},
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quam ſemidiameter circuli complectitur, inuenire. # 353
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XXI. In omni triangulo quadratum maximi lateris min{us} eſt, quam du-
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plum ſummæ quadratorum ex reliquis duob{us} laterib{us} deſcriptorum. # 353
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XXII. Datis trib{us} rectis vtcunque in plano non parallelis, niſi quando
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extremæ à media æqualiter diſtant, rectam lineam ducere, & quidem per datum
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punctum in media, ſi omnes tres in vno puncto conueniant, ita vt ei{us} ſegmen-
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ta inter mediam, & extrem{as} ſint inter ſe æqualia, vel datam habeant propor-
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tionem. # 354
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XXIII. Cui{us}libet lineæ, quamuis minimæ, exhibere multiplicem quam-
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cunque, etiamſi circino non accipiatur. # 355
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XXIV. Ex qualibet lineola quamuis minima, auferre partem, vel partes
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imperat{as}. # 355
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XXV. Angulum datum rectilineum in tres æquales partes partiri. # 356
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XXVI. Si per idem punctum diametri in rectangulo duæ lineæ ducantur
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laterib{us} parallelæ: Erit rectangulum ſub ſegmentis diametri comprehenſum
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æquale duob{us} rectangulis ſub ſegmentis duorum laterum comprehenſis. # 357
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COROLLARIVM. In quadrato rectangulum ſub ſegmentis
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diametri comprehenſum, æquale eſt duobus complementis. # 357
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XXVII. Dato centro Ellipſis in linea axis in infinitum producta vnà
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cum duob{us} punctis ad eaſdem partes axis, vel centri, per quæ tranſire dicatur
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Ellipſis: Vtrumque axis vtriuſque extremum inuenire. # 357
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XXVIII. Si in circuli diametro producta punctum ſumatur, ab eoque re-
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cta circulum tangens ducatur, à puncto autem contact{us} chorda ducatur ad dia-
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metrum perpendicularis: Recta ex eodem contact{us} puncto ad vtrumlibet ex-
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tremum diametri ducta diuidet angulum à tangente, & prædicta perpendicu-
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lari comprehenſum bifariam. Item ſi ab eodem puncto in diametro producta
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aſſumpto recta ducatur circulum ſecans, & ab alterutro ſectionis puncto ad in-
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terſectionem diametri cum prædicta chorda perpendiculari recta iungatur: Re-
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cta ex eoaem ſectionis puncto ad vtrumlibet diametri extremum ducta </
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