Theodosius <Bithynius>; Clavius, Christoph
,
Theodosii Tripolitae Sphaericorum libri tres
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crũt ſinus arcuum circa reliquum angulum vnius
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ſinubus arcuum circa reliquum angulum alterius
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proportionales, homologiq́; </
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<
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æquales angulos ſubtendentium. </
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<
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xml:space
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lus vnius vniangulo alterius ſit æqualis, ſinusq́; </
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<
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cuum circa alium angulum vnius ſinubus arcuum
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circa alium angulum alterius proportionales, ita
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vt ſinus arcuum æquales angulos ſubtendentium
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ſint homologi: </
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<
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<
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rum ſinuum homologorum oppoſiti inter ſe æ-
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quales, vel æquales duobus rectis.</
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<
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æquales B, E, necnon duo C, F. </
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AC, vt eſt ſinus arcus DE, ad ſinum arcus DF. </
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AB, ad ſinum anguli C, ita ſinus arcus AC, ad ſinum
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anguli B; </
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<
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num arcus AC, ita ſinus anguli C, ad ſinum anguli B,
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hoc eſt, ita ſinus anguli F, ad ſinum anguli E, cum hi
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anguli illis ponantur æquales. </
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<
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nus arcus DE, ad ſinum anguli F, ita ſinus arcus DF,
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<
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ad ſinum anguli E; </
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<
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">erit permutando, vt ſinus arcus
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DE, ad ſinum arcus DF, ita ſinus anguli F, ad ſinum
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anguli E. </
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<
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arcus AB, ad ſinum arcus AC, vt eſt ſinus anguli F,
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ad ſinum anguli E. </
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ſinum arcus AC, ita ſinus arcus DE, ad ſinum arcus DF. </
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<
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cus AC, vt eſt ſinus arcus DE, ad ſinum arcus DF. </
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<
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F, æquales eſſe, vel certe duobus rectis æquales. </
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<
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xml:space
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ita eſſe ſinum arcus AB, ad ſinum arcus AC, vt eſt ſinus anguli C, ad ſinum
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Et permu-
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tando.</
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anguli B. </
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li F, ad ſinum anguli E. </
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<
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cus AC, ita ſinus arcus DE, ad ſinum arcus DF; </
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num anguli B, ita ſinus anguli F, ad ſinum anguli E: </
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anguli B, ad ſinum anguli C, ita ſinus anguli E, ad ſinum anguli F. </
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ſinus æqualium angulorum B, E, æquales ſint, erunt & </
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F, æquales; </
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les. </
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&</
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