Theodosius <Bithynius>; Clavius, Christoph
,
Theodosii Tripolitae Sphaericorum libri tres
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AC, æquales ponuntur ſemicirculo BAD; </
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reliqui arcus AC, AD, æquales. </
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">angulus ACD, angulo D, æqua-
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lis erit. </
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angulus ACD, angulo B. </
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nora ſemicirculo BAD. </
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muniarcu AB, erit reliquus AC, reliquo
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AD, minor; </
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<
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">ac propterea angulus ACD,
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maior angulo D, hoc eſt, angulo B, qui an-
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gulo D, æqualis eſt. </
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<
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<
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iora ſemicirculo BAD. </
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muni arcu AB, erit reliquus AC, reliquo
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AD, maior; </
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angulo D, æqualis ſit angulus B, erit quoque angulus B, maior angulo ACD,
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hoc eſt, angulus ACD, angulo B, minor erit. </
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&</
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producto, externus angulus æqualis fuerit interno
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oppoſito ſupra arcum productum, erunt duo reli-
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qua latera ſimul æqualia ſemicirculo: </
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gulus externus maior fuerit interno eodem, & </
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poſito, erunt duo reliqua latera ſemicirculo mi-
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nora: </
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to dicto minor fuerit, erunt duo latera reliqua ſe-
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micirculo maiora.</
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Sit primum angulus ACD, externus æqua-
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lis interno oppoſito B. </
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AC, ſemicirculo eſſe ęqualia, &</
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angulus B, angulo D, æqulis ſit, erit quo-
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que angulus ACD, angulo D, æqualis;
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</
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Addito ergo communi arcu AB, erunt duo
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arcus AB, AC, ſemicirculo BAD, æqua-
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les. </
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<
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gulo B, æqualis eſt; </
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<
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<
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