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

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_CONVERSVM_quoq; huius demonſtratur in alia verſione hoc theoremate.
_IN_ eadem figura ex _C,_ polo ad circunferentiã circuli _A B,_ ductarecta _C B,_ ſit
equalis
lateri quadrati in circulo _A B,_ deſcripti.
Dico _A B,_ circulum eſſe maxi-
mum
.
Ducatur enim ex _C,_ ad circulum _A B,_ perpendicularis _C E,_ quæ in eius
131311. vndec. centrum cadet, quod ſit _E._
Ducta autem ſemidiametro _E B,_ erit ex deſin. 3. lib. 11.
14149. huius. Eucl. angulus _E,_ rectus. Igitur quadratum in circul _A B,_ deſcriptum, æquale eſt
quadratis
ex _B E, C E:_
ſed quadratum ſemidiametri _B E,_ dimiaium eſt quadrati
151547. primi. in circulo _A B,_ deſcripti, vt mox oſtendemus.
I gitur & quadratum ex _C E,_ eiuſ-
dem
quadrati in circulo _A B,_ deſcripti dimidium erit;
atque adeo quadrata ex
_B
E, C E,_ inter ſe æqualia, necnon &
lineæ propterea _B E, C E._ aquales erunt.
Quare cum _C E,_ ducta ſit ex C, polo circuli _A B,_ ad ipſum circulum perpendicu-
laris
, oſtenſaq̀;
ſit ſemidiametro _B E,_ aequalis; erit circulus _A B,_ maximus.
1616Schol. 15.
huius
.

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