Clavius, Christoph, Geometria practica

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364334GEOMETR. PRACT. cus LF, FC, CG, GB, bifariam, & hos rurſus bifariã, & c. connectemuſq; rectas,
donec
fiat exceſſus minor ex ceſſu H, per ſuperius principium Cardani.
Quo-
niam
igitur arcus L B, prima quantitas ſuperat ſecundam, videlicet rectas L F,
FC
, CG, GB, ſimul exceſſu I;
Et tertia quantitas, nimirum ſumma rectarum AL,
AB
, ſuperat quartam, id eſt, ſummam rectarum LD, DE, EB, exceſſu H:
Eſt que
exceſſus
I, minor exceſſu H;
Et prima quantitas, hoc eſt, arcus BL, ponitur non
minor
, quam tertia ex AB, AL, conflata;
item tertia AB, AI, maior, quam quar-
ta
LD, DE, EB:
erit per 1. Lemma, minor proportio arcus BL, primæ quantita-
tis
ad ſecundam LF, FC, CG, GB q@iam tertiæ quantitatis AL, AB, ad quartam
L
D, D E, E B;
Et permutando minor erit proportio arcus L B, ad A L, A 11ſchol. 27.
quinti
.
ſimul, quam rectarum LF, FC, CG, GB, ſimul ad rectas LD, DE, EB, ſimul.
Sit
ergo
vt compoſita ex LF, FC, CG, GB, ad compoſitam ex LD, DE, EB, ita ar-
cus
BK, ad rectas AL, AB, ſimul:
Eritque propterea minor etiam proportio ar-
cus
B L, ad AL, AB, ſimul, quam arcus B L, ad arcum BK;
ideo que arcus 2210. quinti. maior erit arcu BL. Cum ergo eadem ſit proportio rectarum LF, FC, CG, GB,
ſimul
ad LD, DE, EB, ſimul, quæ arcus BK, ad AL, AB, ſimul:
ſintque per 3. Lem-
ma
, rectæ LF, FC, CG, GB, ſimul minores, quam LD, DE, EB, ſimul;
erit quo-
que
arcus B K, minor, quam AL, AB, ſimul.
Multò ergo minor erit arcus BL,
duabus
AL, AB, ſimul.
Quare rectæ tangentes AL, AB, ſimul maiores ſunt ar-
cu
BL, quod erat oſtendendum.

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