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

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_PARI_ ratione in eodem
circulo
, vel in circulis æqua-
44In eodem
circulo
, aut
æqualibus
,
arcuum
æ-
qualium

finus
æqua
les
ſunt; &
contra
. At
arcuũ
in æ-
qualium
ſi
nus
inęqua
les
ſunt; &
contra
.
libus, ſinus tam recti, quàm
verſi
, aut ſinus complemento-
rum
arcuum æqualium, &

quadrante
minorum, æquales
ſunt
:
Et contra, æqualium ſi-
nuũ
tam rectorum, quàm ver
ſorum
, aut ſinuum complemen
torum
, arcus quadrãte mino-
res
æquales ſunt.
Arcuũ verò
inæqualium
, &
quadrante minorum, ſinus inæquales ſunt, ſinus quidem tam rectus
quàm
verſus maioris maior, minoris verò minor;
ſinus autem compleẽti maioris
arcus
minor, &
minoris maior; Et contra, inæqualium ſinuum tam rectorum,
quam
verſorum, aut ſinuum complementorum, inæquales arcus ſunt, maioris qui-
dem
ſinus tam recti quàm verſi maior arcus, &
minoris minor; maioris autem
ſinus
complementi arcus minor, &
minoris maior. Sint enim arcus æquales _BF,_
_DG
._
Dico eorum ſinus rectos _FK, GL,_ æquales eſſe; Item ſinus verſos _KB, LD;_
nec non ſinus complementorũ _EK, EL._ Cum enim arcus _BF, DG,_ æquales ſunt,
erunt
quoque anguli _BEF, DEG,_ æquales.
Sunt autẽ & recti anguli _K, L,_ æquales,
5527. tertij. nec non &
latera _EF, EG,_ æqualia, vtpote ſemidiametri. Igitur & tam latera _FK,_
_GL
,_ quàm latera _EK, EL,_ inter ſe æqualia erunt, nempe ſinus recti inter ſe, &
ſi-
6626. primi. nus complementorum inter ſe.
Detractis autem _EK, EL,_ æqualibus ex ſemidiametru
_EB
, ED,_ reliqui erunt ſinus verſi _KB, LD,_ æquales.
quod eſt propoſitum. Sint iam
ſinus
æquales ſiue recti _FK, GL,_ ſiue verſi _KB, LD,_ ſiue ſinus complementorum _EK,_
_EL
._
Dico arcus _BF, DG,_ eſſe æquales, Nam ſi _FK, GL,_ ſint æquales, erunt

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