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

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411399 eirculi AECF, perpendiculares BP, GQ. Et quoniam rectæ BP, GQ, ca-
dunt
in communes ſectiones circulorum IBK, LGM, cum circulo AECF,
1138. vndec.
11
. 1. Theod.
quem bifariam ſecãtin punctis I, K;
L, M, hoc eſt, cadũtin diametros circulorũ
maximorum
IBK, LGM;
259[Figure 259] (quòd horum circulorum
2215. 1. Theod. plana recta ſint ad planum
circuli
AECF,) ac proin-
de
rectos angulos faciunt
cum
diametris circulorum
IBK
, LGM, ex defin.
3.
lib. 11. Eucl. erit quoque
tam
BP, ſinus rectus arcuũ
BI
, BK, quam GQ, ſinus
rectus
arcuum GL, GM,
ex
definitione ſinus recti.

Ducantur
in plano circuli
AECF
, rectæ NP, OQ;

eruntq
;
per defin. 3. lib. 11.
Eucl
.
anguli P, Q, recti, in
triangulis
NBP, OGQ.

Quia
verò tam rectæ BN,
3328. primi. GO, parallelę ſunt, propter
angulos
rectos ANB, AOG,
quam
rectæ BP, GQ, cum perpendiculares ſint ad planũ circuli AECF;
446. vndee. erunt quoque anguli B, G, æquales in eisdem triangulis NBP, OGQ.
5510. vndee. AEquiangula igitur ſunt triangula NBP, OGQ; atque adeò erit, vt NB,
6632. primi. ſinus arcus AB, vel CB, ad BP, ſinum arcus BI, vel BK, ita OG, ſinus ar-
774. ſexti. cus AG, vel CG, ad GQ, ſinum arcus GL, vel GM, quomodocunque ar-
cus
ſumantur, cum cuilibet ſinui duo arcus ſemicirculũ conficientes reſpon-
deant
.
Hcc eſt, erit, vt ſinus arcus AB, ad ſinum arcus BI, ita ſinus arcus AG,
ad
ſinum arcus GL.
Item vt ſinus arcus AB, ad ſinum arcus BK, ita ſinus ar-
cus
AG, ad ſinum arcus GM.
Item vt ſinus arcus CB, ad ſinum arcus BI, ita
ſinus
arcus CG, ad ſinum arcus GL.
Item vt ſinus arcus CB, ad ſinum arcus
BK
, ita ſinus arcus CG, ad ſinum arcus GM.
Item vt ſinus arcus AB, ad
ſinum
arcus BI, ita ſinus arcus CG, ad ſinum arcus GM, &
c.

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