Clavius, Christoph, Geometria practica

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272242GEOMETR. PRACT. ad I Y, hoc eſt, ita quadratum G, ad rectangulum I Z: Eſt autem 111. ſexti. B C F, maius quadrato G, ſiue rectilineo A: (quando enim ad partes angulo-
rum
, qui duo bus rectis minores ſunt, conſtruendum eſt trapezium dato recti-
176[Figure 176] lineo æquale, debet eſſe triangulum maius rectilineo) erit quo que 2214. quinti. lum V C T, maius rectangulo I Z.
Igitur vt Num. 3. traditum eſt, conſtruatur
trapezium
V b, rectangulo I Z, æquale:
& tribus rectis C V, V a, C B, inuen-
ta
quarta proportionali B D, (tranſibit autem recta ducta C a, per D, 33ſ@hol. 4.
ſexti
.
quarta B D, ritè eſt inuenta, ita vt viciſsim recta C a, ſi ex quiſitè ducatur, ex- hibeat quartam proportionalem quæſitam B D,) demittatur D E, ipſi B C, pa-
444. ſexti. rallela.
Dico trapezium B E, dato rectilineo A, æquale eſſe. Quoniam enim
trapezium
B E, trapezio V b, ſimile eſt, per ea, quæ ad propoſ.
18. libr. 6. Eu-
clid
.
demonſtrauimus; erit trapezium B E, ad trapezium V b, vt recta B C, 55coroll. 20.
ſexti
.
rectam X, hoc eſt, vt recta HI, ad IY, hoc eſt, vt quadratum G, ad rectangu- lum I Z.
Cum ergo trapezium V b, rectangulo I Z, æquale ſit; erit 661. ſexti. que trapezium BE, quadrato G, hoc eſt, rectilineo A, æquale. quod eſt propo-
7714. quinti.ſitum.

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