Clavius, Christoph, Geometria practica

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244214GEOMETR. PRACT. tam Tetraedri ſuperficiem conficiet: In Octaedro deinde duodecies acceptum
11Superficies re
gularium
cor
porum
& per-
pendicular
{es}
baſium
.
toti ſuperficiei Octaedri adæquabitur:
Atin Dodecaedro, & Icoſaedro tricies
ſumptum
ſuperficiei totitam Dodecaedri, quam Icoſaedri æquale erit.
Dicta au-
tem
perpendicularis EF, in baſe cubi æqualis eſt ſemiſsilateris cubi AB, Quo- niam enim perpendicularis EF, ſecat latus AB, bifariam, eſt que ipſi AF, æqua- lis, quod anguli FAE, FEA, ſemirecti ſint;
conſtat EF, ſemiſsi lateris cubi eſſe ę-
22ſchol. 26.
primi
.
qualem.
Perpendicularis autem DE, in baſe Tetraedri; Octaedri, & Icoſaedri,
ſemiſsis eſt ſemidiametri C D.
Cum ergo latus A C, ſit potentia triplum 336. primi. midiametri CD: Si fiat, vt 3. ad 1. ita quadratum lateris dati AC, ad aliud, prodi-
442. coroll. 12.
tertijdec
.
bit quadratum ſemidiametri C D, cuius radix quadrata ipſam C D, indicabit, e-
iuſque
ſemiſsis perpendicularem DE, exhibebit.
Perpendicularis denique FG,
5512. tertijdec. in baſe Dodecaedrie ſemiſsis eſt ſummæ ex ſemidiametro AF, &
latere decago-
661. quartidec. ni circuli ABD, collectæ, quodlatus decagoni cognoſcetur, vt ad finem Nume.
4. traditum eſt.

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