Clavius, Christoph, Geometria practica

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187157 117[Figure 117]
GEOMETRIÆ
PRACTICÆ
LIBER QVARTVS.
118[Figure 118]
AREAS
Superficierum planarum inueſtigans.
QVEMADMODVM linea recta rect{as} line{as} meti-
11Pen{es} quid
menſuræ li-
nearum re-
ctarum, pla-
narum ſuper-
ficierum &
ſolidorum ſu-
mantur.
tur, ita Geometræ ſuperficies plan{as} per ſuperficiem qua-
dratam, &
corpora, ſiue ſolida, per corp{us} cubicum me-
tiri ſolent.
Nam ſicut linea recta dicitur 100. palmorum
in qua linea vni{us} palmi centies continetur, ita ſuperfi-
cies plana dicitur 100.
palmorum, quæ centies quadra-
tum continet, cui{us} lat{us} palmo æquale est:
& ſolidum
100.
palmorum illud dicitur, quod complectitur 100. cubos, quorum quilibet la-
t{us} habet vni{us} palmi:
quod de aliis etiam menſuris, vt de pede, cubito, paſſu,
milliario, &
c. intelligendum est. Quia vero quælibet ſuperficies tot quadrata
cuiuſque menſuræ comprehendere dicitur, quot in parallelogrammo rectangulo,
quod illi æquale est, continentur, explicandum primo loco erit, quaratione area
cuiuſlibet rectanguli cognoſcatur.
Deinde de area triangulorum, quadrilatero-
rum non rectangulorum, cæterarumque figurarum plurium laterum @gem{us}:
ac denique circulum, eiuſque partes metiemur.
DE AREA RECTANGVLORVM
Capvt I.
22Area qua-
drati, & alte-
ra parte lon-
gioris quo pa-
cto cognoſca-
tur.
QVoniam Euclides defin. 1. lib. 2. docet, omne parallelogram-
mum rectangulum contineri ſub rectis duabus lineis, quæ rectum
comprehendunt angulum;
manifeſtum eſt, aream cuiuſque re-
ctanguli produci ex multip licatione duorum laterum circa

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