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

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THEOR. 4. PROPOS. 6.
DIFFERENTIA chordarũ duorum arcuũ
22Differentia
inter
chor-
das
duorũ
arcuũ
, quo-
alter
to
ſit mi-
nor
arcu
grad
. 120.
quáto
alter
maior
eſt,
ęquat
chot
arcus,
quo
alteru-
ter
dictorũ
arcuũ
dif-
fert
ab arcu
grad
. 120.
ſemicirculi, quorum alter tãto minor ſit arcu grad.
120. quanto alter maior eſt, æqualis eſt chordæ ar-
cus
, quo alteruter dictorum arcuum ab arcu grad.

120
.
differt.
IN ſemicirculo ABC, ſit arcus BA, grad. 120. arcus vero BD, eo tan-
to
minor, quanto arcus BE, maior eſt;
quorum chordæ BD, BE: abſcin-
daturq́ue
BF, ipſi BD, æqualis, &
iungantur rectæ AD, AE, AF. Dico EF,
differentiã
duarũ chor
124[Figure 124] darum BD, BE, æqua-
lem
eſſe chordæ AE,
vel
AD.
Cõpleto enim
circulo
, &
inſcriptotriã
gulo
æquilatero ABG,
cuius
vnum latus eſt
AB
, chorda arcus grad.
120. cum ſubtendat ter
tiã
circunferentiæ par-
tem
;
erit angulus AGB,
tertia
pars duorum re-
3332. primi.
21
. tertij.
ctorum.
Cum ergo ei æqualis ſit angulus AEB, in eodem cum illo

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