Theodosius <Bithynius>; Clavius, Christoph
,
Theodosii Tripolitae Sphaericorum libri tres
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atque Secantes.</
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ſua problemata, atque theoremata per ſolos ſi-
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nus explicare poßint, vt communiter ab omni-
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bus fieri ſolet, quia tamen multa facilius, ac bre-
<
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uius expediuntur, ſi vnà cum ſinubus lineætan-
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gentes, ſecantesque adhibeantur, vt ex doctri-
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na triangulorum erit manifestum; </
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<
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demlineas vtili ſane conſilio Recentiores exco-
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gitarunt, atque in tabulas redegerunt: </
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<
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est has etiam lineas paucis exponere, vt doctri-
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na noſtrorum triangulorum perfectior euadat.
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<
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triangulo -
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rũ in quo
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conſiſtat.</
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tribus hiſce line arum generibus, nempe in ſinu-
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bus, lineis tangentibus, & </
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mum conſiſtere videtur. </
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<
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candum eſt, quid ſit linea tangens, & </
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cans propoſiti cuiuſuis arcus.</
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ergoab altero extremo cuius libet arcus, qui quadrante minor ſit, ſemi-
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gens, & ſe-
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cans quid.</
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diameter ducta fuerit, in cuius extremitate recta linea circulum tangat, & </
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alierum extremum eiuſdem arcus extendatur alia recta linea ex centro ad tangen-
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tem lineam vſque: </
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<
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dientes, Linea tangens illius arcus, quem eædẽ duæ rectæ e centro eductæ includunt:
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citur Linea ſecans eiuſdem arcus. </
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cus AB, quadrante minor, & </
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, ab extremitate </
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