Ceva, Giovanni, Geometria motus, 1692

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QVam rationem habet rectangulum BAE ad ſpatium
& BAE &, eandem habet rectangulum CDE ad

ſpatium
& CDE, & permutando erit rectangu­
lum
BAE ad CDE, ſicut ſpatium & BAE & ad ſpatium̨
& CDE &; ſi igitur in eadem propoſita hyperbola ſit po­
teſtas
applicatarum DC, AB quintuplicata ipſius A ad B,
& AE ad ED ſeptuplicata ſit eiuſdem; erit ſeptuplicatą
applicatarum
in eadem ratione, ac quintuplicata abſciſſa­
rum
; ſcilicet quadratoquadratocubus ex DC ad ſimilem
poteſtatem
ex AB erit vt quadratocubus ex AE ad qua­
dratocubum
ex DE, eritque ſic maior poteſtas applicata­
rum
, atque adeo componetur rectangulum EAB ad EDC
ex
ſeptuplicata ipſius A ad B, qualis eſt AE ad ED, & ſub­
quintuplicata
eiuſdem A ad B, quæ eſt AB ad DC; nimi­
rùm
erit rectangulum EAB ad EDC in duplicata tantum
ratione
ipſius A ad B: quare ſpatium & BAE & ad id
& CDE &, quæ ſunt inter ſe, vt ipſa rectangula, erit vt po­
teſtas
ex A, cuius exponens eſt differentia exponentium &
S
poteſtatum hyperbolæ ad ſimilem poteſtatem ex B.
Quod &c.
Pr. 12. huius.
PROP. XV. THEOR. XV.

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