Theodosius <Bithynius>; Clavius, Christoph
,
Theodosii Tripolitae Sphaericorum libri tres
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perficiem cadentes ſint æquales, ac proinde & </
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">earum quadrata æqualia; </
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xml:space
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tem tam quadratum ex G C, quadratis ex G H, H C, quàm quadratum ex
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G E, quadratis ex G I, I E, æquale; </
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<
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xml:space
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">erũt quadrata ex G H, H C, ſimul æqua-
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lia quadratis ex G I, I E, ſimul. </
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<
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xml:space
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">Demptis ergo æqualibus quadratis rectarum
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G H, G I, (poſitæ enim ſunt hæ lineæ æquales) æqualia erunt reliqua quadra
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ta rectarum H C, I E, ac proinde & </
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xml:space
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xml:space
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ſint ſemidiametri circulorum B C, F E, æquales erunt circuli ipſi B C, F E.</
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<
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">QVOD ſi alter horũ circulorũ, nempe B C, longius à centro G, ponatur
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diſtare, quàm alter F E, hoc eſt, perpẽdicularis G H, maior ponatur perpen-
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diculari G I, oſtendemus eodem fere modo, circulum B C, minorem eſſe cir-
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culo F E. </
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<
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xml:space
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">Cum enim quadrata ex G H, H C, æqualia ſint demonſtrata qua-
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dratis ex G I, I E; </
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G H, G I, quorum illud maius eſt,
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(quòd & </
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">recta G H, maior ponatur
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quàm recta G I,) erit reliquum qua
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dratum rectæ H C, minus quadrato
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reliquo rectæ I E; </
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">re
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cta H C, minor erit, quàm recta I E.
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</
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">circulus B C, circulo F E,
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minor erit.</
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<
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ximus A D. </
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trum ſphæræ tranſire. </
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tranſeat per centrũ, erit alius quiſ-
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piam circulus per centrum G, tran
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ſiens maior circulo A D, non per
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centrũ tranſeũte, vt in hac propoſ,
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demonſtratum eſt. </
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eſt maximus circulus. </
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ſurdum. </
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<
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ter diſtare. </
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">Conſtructa enim figura, vt prius, erunt ſemidiametri H C, I E, æ-
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quales. </
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<
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">Et quoniam quadrata ex G H, H C, æqualia ſunt quadratis ex G I,
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I E, vt demonſtratum eſt; </
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H C, I E, erunt reliqua quadrata rectarum G H, G I, æqualia; </
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lineæ G H, G I, æquales erunt. </
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">Quæ cum perpendiculares ſint, ex conſtru-
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ctione, ad plana circulorum B C, F E, æqualiter à centro G, diſtabunt cir-
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culi B C, F E, ex defin. </
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<
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">QVOD ſi alter circulorum B C, F E, nimirum circulus B C, minor po-
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natur altero circulo F E, oſtendemus eodem ferè modo, perpendicularem
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G H, maiorem eſſe perpendiculari G I. </
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<
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oſtenſa ſint æqualia quadratis ex G I, I E; </
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nus quadrato ex I E; </
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ſemidiametro I E, circuli maioris) erit quadratum reliquum rectæ G H, reli
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quo quadrato rectæ G I, maius; </
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<
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G I. </
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circulorum, longius diſtabit, per defin. </
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<
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tro G, quàm circulus maior F E. </
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