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

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QVOD _ſi quando perpendicularis_ Ef, _ſemidiametrum_ AC, _ſecet bifariam, vt_
_in
hac figura contingit, erit adhuc_ CH, _ſinus arcus_ CD,
122[Figure 122] _medio loco proporlionalis inter_ Cf, _ſemiſſem ſinus totius,_
&
Cf, _ſinũ verſum arcus_ CE, _qui arcus_ CD, _duplus eſt. Erũt_
_enim
rurſum triangula_ ACH, ECf, _æquiangula;
ac_
_proinde
, vt_ AC, _ad_ CH, _ita_ EC, _ad_ Cf:
_Et permutan-_
444. fexti. _do, vt_ AC, _ad_ CE, _ita_ CH, _ad_ Cf.
_Cum ergo ſit, vt_
AC
, _ad_ Cf, _dimidium ipſius_ AC, _ad_ CH, _dimi-_
5515. quinti. _dium ipſius_ Ce;
_erit quoq; vt_ Cf, _ad_ CH, _ita_ CH, _ad_ Cf:
_proptereaq́;_ CH, _ſinus rectus arcus_ CD, _medio loco propor-_
_tionalis
eſt inter_ Cf, _ſemiſſem ſinus totius,_ &
Cf, _ſinum ver_
_ſum
arcus_ CG, _qui duplus eſt arcus_ CD.
HINC _fit, ſiperpendicularis_ EF, _ſemidiametrum_ AC, _ſecet bifariam, rectam_
CH
, _æqualem eſſe rectæ_ Cf.
_Si enim maior eſſet, aut minor, non poßet eſſe, vt_ Cf,
_ad_
CH, _ita_ CH, _ad_ Cf:
_cum vna proportio eſſet maioris inæqualitatis, & altera_
_minoris
inæqualitatis._
66Sinus rectꝰ
grad
. 54. æ-
qualis
eſt
ſemiſsi
ſinꝰ
totiꝰ
, & ſi-
nui
gra. 18.
ſimul
. Sinꝰ
aũt
verſus
grad
. 72 æ-
qualiseſt
ſe
miſſi
ſinus
totius
, & ſi-
nui
verſo
grad
. 36. ſi-
mul
.

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