Theodosius <Bithynius>; Clavius, Christoph, Theodosii Tripolitae Sphaericorum libri tres

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376364
THEOR. 9. PROPOS. 11.
IN triangulo ſphærico ABC, ſit angulus ACB, angulo A, maior. Dico
207[Figure 207] latus AB, maius eſſe latere BC.
Quoniam angulus
9910. huius. ACB, maior ponitur angulo A, fiat angulus ACD,
angulo
A, æqualis, ſecetq́ue arcus CD, arcum AB,
in
D.
Quoniam igitur in triangulo ADC, anguli
A
, &
ACD, æquales ſunt; erunt & latera AD, CD,
10109. huius. æqualia.
Addito ergo communiarcu DB, erunt ar-
cus
BD, DC, æquales arcui AB:
Sed arcus BD,
DC
, ſimul maiores ſunt arcu BC.
Igitur & arcus
11113. huius. AB, eodẽ arcu BC, maior erit.
Quod eſt propoſitũ.

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