Theodosius <Bithynius>; Clavius, Christoph, Theodosii Tripolitae Sphaericorum libri tres
page |< < (116) of 532 > >|
55Duæ chor-
duorum
arcuũ
cõſi-
ciẽtiũ
gra.
120
. ſimul
ęquales
sũt
chordęarcꝰ

cõpoſiti
ex
arcu
grad.
120
. & arcu
minore
il-
lorum
duo
rum
.
THEOR. 5. PROPOS. 7.
SVPERET quantitas AB, quantitatẽ C, exceſſu DB, qui bifariã ſecetur in
125[Figure 125] E, &
ipſi EB, æqualis pona
tur
AF.
Quoniã igitur AF,
EB
, toti exceſſui DB, æ-
quales
ſunt, erit reliqua
FE
, ipſi C, æqualis.
Sece-
tur
FE, bifaria in G.
Quia
ergo
GE, GF, æquales
sũt
;
additis æqualibus EB,
FA
, æquales quoque erũt
GB
, GA;
ac proinde & AB,
in
G, ſecta erit bifariã.
Se-
miſsis
igitur BG, ipſius
AB
, ſuperat GE, ſemiſſem
ipſius
FE, hoc eſt, ipſius C, exceſſu EB, qui ſem iſsis eſt exceſſus DB.
Si quan-
titas
ergo quantitatem excedat, &
c. Quod demonſtrandum erat.
THEOR. 6. PROPOS. 8.

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