Clavius, Christoph, Geometria practica

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Sine reductione vmbrę verſę ad rectam ita agendum erit. Numerus, qui fit
ex
vmbra verſa D E, in vmbram rectam b H, auferatur ex 1000000.
quadrato
lateris
1000@ reſi duumque ſit P.
Item ex vmbra verſa DE, in latus 1000. fiat Q.
Et quoniam ob triangulorum ſimilitudinem eſt, vt BN, ad BA, ita AF, ad F G: 114. ſexti. Etpermutando, vt BN, ad AF, ita BA, ad FG. Sed vt BN, vmbra recta maior ad
A
F, diſtantiam, ita eſt I N, differentia vmbrarum rectarum ad A a, differentiam
ſtationum
, vt Num.
5. in problem. 3. dictum eſt. Igitur erit quoque IN, ad Aa,
ſicuti
AB, ad FG:
Et permutando IN, ad AB, vt Aa, ad FG. Dico iam ita eſſe
P
, ad Q, vt IN, ad AB.
Quoniam enim eſt, vt DE, ad AD, ita AB, vel AD, 224. ſexti.BN: erit rectangulum ſub DE, BN, ęquale quadrato numero 1000000. 3317. ſexti. AB, 1000. Eſt autemrectangulum ſub DE, BN, æquale rectangulis ſub DE,441. ſecundi. BI, & ſub DE, IN. Igitur ſi productum ex vmbra verſa DE, in B I, hoc eſt, in
vmbram
rectamb H, dematur ex rectangulo ſub DE, BN, hoc eſt, ex quadrato
1000000
.
remanebit rectangulum ſub DE, IN. Ac propterea P, fiet ex DE, in
IN
.
Fit autem Q, ex eadem vmbra verſa DE, in latus AB, 1000. Igitur cum DE,
multiplicans
IN, &
AB; producat P, Q, erit P, ad Q, ſicut IN, ad AB; 5517. ſexti.@ eſt, ſicut Aa, ad FG. Quocirca ſi fiat.

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