Clavius, Christoph, Geometria practica

Table of Notes

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page |< < (357) of 450 > >|
385357LIBER OCTAVVS.
PROBL. 17. PROPOS. 26.
In rectangulo BD, per E, punctum diametri AC, ductæ ſint FG, HI, lateri-
bus
parallelæ.
Dico rectangulum ſub AE, EC, æquale eſſe rectangulis ſub AF,
114. ſecundi. FB, &
ſub BI, IC. Quoniam enim quadratum ex AC, æquale eſt quadratis 2247. primi. AE, EC, vna cum rectangulo bis ſub AE, EC. Suntautem quadrata ex AB, BC, quadrato ex AC, æqualia; erunt quoque duo quadrata ex AE, EC, vna
cum
rectangulo bis ſub AE, EC, æqualia quadratis ex
277[Figure 277]334. ſecundi. AB, BC.
Sed quadratum ex AB, æquale eſt quadra- tis duobus ex AF, FB, vna cum rectangulo bis ſub AF,
FB
;
Et quadratum ex BC, æquale eſt duobus quadra-
tis
ex BI, IC, vna cum rectangulo bis ſub BI, IC.
Igi-
tur
duo quadrata ex AE, EC, vna cum rectangulo bis
ſub
AE, EC, æqualia erunt quatu or quadratis ex AF,
FB
, BI, IC, vna cum rectangulis bis ſub AF, FB, &
ſub BI, IC. Cum ergo 4447. primi. dratum ex AE, quadratis ex AF, FE, hoc eſt, ex AF, BI: & quadratum ex EC,
quadratis
ex EI, IC, hoc eſt ex FB, IC:
æquale ſit; Erunt quatuor quadrata
ex
AF, BI, FB, IC, vna cum rectangulo bis ſub AE, EC, æqualia quatuor qua-
dratis
ex AF, FB, BI, IC, vna cum rectangulis bis ſub AF, FB, &
ſub BI, IC; Ab-
latiſque
vtrobique prædictis quatuor quadratis communibus, eritreliquum re-
ctangulum
bis ſub AE, EC, reliquis rectangulis bis ſub AF, FB, &
ſub BI, IC, æ-
quale
.
Ideo que rectangulum ſemel ſub AE, EC, rectangulis ſemel ſub AF.
FB, & ſub BI, IC, erit æquale. quod erat demonſtrandum.

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