Clavius, Christoph, Geometria practica

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284254GEOMETR. PRACT. nitur, cuiæ quidiſtans ducenda eſt, media proportionalis A G, agaturque per G,
ipſi
B C, parallela G H.
Dico hanc parallelam problema efficere, id eſt, eandem
eſſe
proportionem trianguli A G H, ad trapezium B C G H, quæ eſt D, ad E.
Quoniam enim triangulum ABC, ad triangulum A G H, eſt vt latus A C, ad 11coroll. 19.
ſexti
.
ctam AF, quod tres rectæ AC, AG, AF, continuè proportionales ſint, &
triangu-
188[Figure 188] la ABC, AGH, ſuper A C, A G, ſimilia ſimiliter que poſita;
Erit per conuerſio-
nem
rationis triangulum ABC, ad trapezium BCGH, vt AC, ad FC.
Ergo diui-
dendo
erit triangulum AGH, ad trapezium BCGH, vt AF, ad FC, hoc eſt, vt D,
ad
E.
quod eſt prop oſitum. Quod etiam ita colligemus. Quoniam eſt 22coroll. 19.
ſexti
.
gulum A B C, ad triangulum A G H, vt recta A C, ad AF;
erit diuidendo trape-
zium
B G, ad triangulum A G H, vt F C, ad AF:
Et conuertendo triangulum
AGH
, ad trapezium BG, vt AF ad FC, hoc eſt, vt D, ad E.

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