Theodosius <Bithynius>; Clavius, Christoph
,
Theodosii Tripolitae Sphaericorum libri tres
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bus rectis ſint, & </
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">erit ACD, recto maior; </
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propterea maior, quam B, qui recto etiam minor
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ponitur. </
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<
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circulo minores; </
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<
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">atque idcirco, cum ipſi ſint ę qua-
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les, vterque quadrante minor erit. </
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<
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poſitum.</
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<
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obtuſus. </
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rem eſſe quadrante. </
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ſint æquales duobus rectis, & </
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recto, erit ACD, recto minor, atque idcirco mi-
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nor angulo B, qui recto quoque maior ponitur.
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Arcus ergo AB, AC, ſimul maiores ſunt ſemicir-
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culo; </
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<
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">atque adeò, cum ipſi æquales ſint, erit uterq;
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</
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ergo triangulo ſphærico Iſoſcele, &</
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gula latera ſint quadrantes, habere ſingulos angulos rectos: </
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tos. </
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lum, ſeu æquilaterum, ſi ſinguli anguli ſint recti, habere ſingula latera quadrantes: </
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acuti, quadrante minora: </
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que angulum ad baſim eſſe rectum: </
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que latus eſſe quadrantem, demonſtrari etiam poterit bac ratione.</
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angulos _B, C,_ eſſe rectos. </
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donec coëantin _D,_ vt ſint ABD, ACD, ſemicirculi; </
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quoque arcus _DB, DC,_ quadrantes; </
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arcus _ABD, ACD,_ bifariam diuidetur ab arcu _B C,_ in
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2. Theod.</
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punctis _B,_ & </
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_AC,_ tranſibit; </
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efficiet.</
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_AC,_ quadrantes eſſe. </
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<
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tranſibit arcus _BC,_ per polos arcuum _ABD, ACD,_ qui
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quidem ſemicirculi ſunt; </
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cabit in _B, C._ </
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drantes. </
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