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

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7664 lorum maximorum I M, M O, diameter vtriuſque, cum ſe mutuo ſecent bifa-
11@1. 1. huius. riam) ad angulos rectos, &
diuiduntur non bifariam in I, quod I, polus paral-
lelorum
non ſit polus tangentium;
ponunturque arcus M O, N P, æquales;
erunt ductæ rectæ I O, I B, æquales. Si igitur ex I, polo parallelus deſcriba-
2212. 1. huius. tur O K, ad interuallum I O, tranſibit is quoque per P.
Et quia circulus
maximus
I M, tranſiens per polos circulorum M O, O Q, ſe ſecantium in
O
, Q, ſecat eorum ſegmenta bifariam, æquales erunt arcus M O, M Q, &

339. huius. S O, S Q;
Eodemque argumento æquales erunt arcus N P, N R, & T P,
T
R;
nec non K O, K P, & C O, C P; propterea quòd circulus maximus IkC,
tranſiens
per polos circulorum O K P, O C P, ſecat eorum ſegmenta bifa-
449. huius. riam in K, &
C. Cum ergo arcus M O, N P, ponantur æquales, erunt & toti
85[Figure 85] O M Q, P N R, quorum
ipſi
dimidij ſunt, æqua-
les
;
atque adeo & rectæ
5529. tertij. ſubtenſę O Q, P R, æqua
les
erunt.
Igitur & arcus
6628. tertij. O S Q, P T R, ęquales
erunt
;
ac proinde & eo-
rum
dimidij O S, P T, æ-
quales
erunt.
Sunt autem
&
toti K O, K P, oſtenſi
ęquales
.
Reliqui ergo K S,
K
T, æquales erunt;
atque
adeo
, cum ſint vnius eiuſ-
demq́ue
circuli, ſimiles in
ter
ſe erunt.
Quia verò ar-
7710. huius. cubus K S, K T, ſimiles
ſunt
arcus H M, H N;
erũt
quoq
;
æquales arcus H M,
H
N.
Itaque cum ſeg-
mentum
B H D, bifariam
889. huius. ſeceturin H, fintque equales arcus H M, H N;
erunt circuli M O, N P, ſimili-
ter
inclinati ad circulum A B C D.
Quare ijſdem poſitis, ſi circunferentiæ à
contactibus
, &
c. Quod erat demonſtrandum.

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