Theodosius <Bithynius>; Clavius, Christoph
,
Theodosii Tripolitae Sphaericorum libri tres
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recta BC, ex hypotheſi. </
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fariã in F, erit punctũ F, in maiori ſegmento AE. </
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<
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<
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latera AF, FD, trianguli AFD, lateribus CF, FD, trianguli CFD, baſisq́;
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<
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">AD, baſi CD, oſtenſa eſt æqualis; </
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<
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">erit angulus AFD, angulo CFD, æqua-
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xml:space
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lis; </
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E, F, duobus rectis ſint minores, erit angulus E, acutus, ac proinde reliquus
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xml:space
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">17. primi.</
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CED, obtuſus. </
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bus rectis minores, erit angulus C, acutus. </
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<
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tus DE, maius latere DF, & </
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ca arcus circuli ex D, centro per E, deſcriptus ſecabit rectam DF, productam
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in H, rectam autem CD, infra punctum C, in G. </
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ad triangulum DEC, maiorem proportionem habet, quam triangulũ DFE,
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adidem triangulum DEC: </
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iorem proportionem habet, quam ad triangulum DEC; </
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<
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iorem proportionem ſector DHE, ad ſectorem DEG, quam triangulum
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DFE, ad triangulum DEC. </
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propoſ. 33.
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lib. 6.</
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ita angulus HDE, ad angulum EDG. </
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<
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guli HDE, ad angulum EDG, quam trianguli DFE, ad triangulum DEC:
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</
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Sed vt triangulum DFE, ad triangulum DEC, ita eſt recta FE, ad rectam
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EC. </
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quæ rectę FE, ad rectam EC. </
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<
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anguli HDG, ad angulum EDG, quam rectæ FC, ad rectam EC. </
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Anguli # Rectæ.
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ADC. # AC.
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HDG. # FC.
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EDG. # EC.
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tur eſt, vt angulus ADC, ad angulum HDG, ita
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recta AC, ad rectã FC: </
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dupla) Angulus autem HDG, ad angulum EDG,
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maiorem habet proportionem, quam recta FC, ad
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rectam EC, vt oſtendimus; </
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<
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que proportio anguli ADC, ad angulum EDG,
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quam rectæ AC, ad rectam EC, vt in hac formula
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apparet. </
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<
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<
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">maior proportio anguli ADE, ad angu-
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<
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lum EDG, quam rectæ AE, ad rectam EC. </
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gulum EDG, ita eſt arcus AB, ad arcum BC; </
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<
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ita eſt chorda AB, ad chordam BC. </
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<
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<
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AB, ad arcum BC, quam chordæ AB, ad chordam BC. </
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<
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ptis duobus arcubus inæqualibus, &</
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