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

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THEOREMA 2. PROPOS. 3.
SI enim fieri poteſt, ſphæra planum, à quo non ſecatur, tangat in pluri-
332. huius. bus punctis vno, vt in A, &
B. Inuento igitur C, centro ſphæræ, ducantur re
10[Figure 10] ctæ C A, C B:
& per C A, C B, ducatur pla-
num
faciens quidem in ſuperficie ſphæræ cir
441. huius. cumferentiam circuli A B D, in plano autẽ
ſecante
rectam lineam E A B F.
Quia igitur
553. vndec. planũ tangens, in quo eſt recta E A B F, ſphæ
ram
non ſecat, atque adeò neque circulum
A
B D, in ſphęrę ſuperſicie exiſtentem, fit vt
neq
;
recta E A B F, circulũ A B D, ſecet. Cadet
ergo
recta A B, tota extra circulũ.
Quoniã
vero
duo puncta ſumpta ſunt A, B, in circũfe
rentia
circuli A B D, cadet eadem recta A B, à
pũcto
A, in punctũ B, ducta tota in tra circulũ
662. tertij. A B D.
Quod eſt abſurdũ. Sphęra igit̃ planũ,
à
quo ſecatur, tangit in pluribus pũctis vno.
Quod erat demonſtrandũ.

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