Clavius, Christoph, Geometria practica

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PROBL. 2. PROPOS. 5.
DATO rectangulo ſupra datam rectam æquale rectangulum facilius,
quam
per propoſ.
45. lib. 1. Euclid. conſtituere.
Sit rectangulum A B C D, cui ſupra datam rectam conſtituendum eſt re-
ctangulum
æquale.
Producto quolibet latere, ni-
258[Figure 258] mirum A B, capiatur B E, æqualis datærectæ, ſiue ea
ſit
maior latere AB, ſiue minor:
atque ex E, per C,
recta
ducatur ſecans AD, productam in F, complea-
turque
rectangulum AH, &
rectæ BC, DC. produ-
cantur
vſque ad G, I.
Eritigitur 2243. primi. CH, complemento CA, ęquale. Cumigitur latus CI,
ſit
lateri BE, id eſt, datærectæ æquale:
factum erit, quod proponitur.
Datæ rectæ BE, & duobus lateribus AB, BC, dati rectanguli, 3317. ſexti. quarta proportionalis C G. Nam rectangulum ſub BE, prima, & CG, 4416. ſexti. comprehenſum, rectangulum videlicet C H, æquale erit dato rectangulo AC,
ſub
ſecunda AB, &
tertia BC, comprehenſo. quod eſt propoſitum.

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