Theodosius <Bithynius>; Clavius, Christoph
,
Theodosii Tripolitae Sphaericorum libri tres
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trum circuli B G D H, atque adeo F, centrum erit circuli. </
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huius.</
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lus B G D H, per centrum ſphæræ ducatur, erit ipſum centrum ſphæræ E,
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idem quod F, centrum circuli; </
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<
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xml:space
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dicularis A C. </
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rum extremis rectæ ad puncta A, C. </
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<
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circuli B G D H, erunt
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anguli omnes, quos ad F,
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facit, recti, ex defin. </
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">quare duo
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triangula A F B, A F H,
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duo latera A F, F B, duo
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bus lateribus A F, F H,
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æqualia habent, quę qui
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dem angulos comprehen
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dunt æquales, nempe re-
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ctos. </
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A H, æquales erunt. </
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dem modo oſtẽ demus & </
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rectas A D, A G, & </
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quaſcunque ex A, ad circumferentiam circuli B G D H, ductas tam inter ſe,
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quàm rectis A B, A H, æquales eſſe. </
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ex defin. </
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culi polum eſſe. </
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oſtendendum.</
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cerunt.</
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<
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<
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laris ad circuli planum, quæ in vtramque partem producatur, cadet
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hæc in vtrumque polum circuli.</
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">_IN_ eadem figura ex _F,_ centro circuli _B G D H,_ erigatur recta _F A,_ perpendi-
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cularis ad circuli planum, quæ occurr at ſuperficiei ſphæræ in punctis _A, C._ </
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_A, C,_ eſſe polos circuli _B G D H._ </
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nes anguli, quos ad _F,_ facit recta _A F,_ recti. </
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_A H,_ &</
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<
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Coroll. 2.
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huius.</
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cta erit recta _E F,_ ex _E,_ centro ſphæræ ad planum circuli _B G D H,_ perpendicu-
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laris. </
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<
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<
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poſitum.</
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