Cavalieri, Buonaventura, Geometria indivisibilibvs continvorvm : noua quadam ratione promota

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483463LIBER VI.
Series ſpatiorum 1. 2. 3. 4. 5. 6. 7.
Series numerorum 1. 7. 19. 37. 61. 91. 127.
328[Figure 328]
cum {1/3}. quadrati, CB, ſi ergo, AB, ſtatuatur 3. erit, AC, 6. rectan-
gulum, CAB, 18.
tertia pars quadrati, BC, erit 3. quæ iuncta ipſi
18.
efficit 21. erit ergo qualium partium quadratum, AB, eſt 9. re-
ctangulum, CAB, cum tertia parte quadrati, BC, 21.
& tertia pars
quadrati, AB, eſt 3.
eſt igitur ſpatium, AIN, ad trilineum, AMN,
vt 3.
ad 21. ideſt vt 1. ad 7. Eodem modo reperiemus trilineum, A
NM, ad, AMH, eſſe vt 7.
ad 19. & hoc ad trilineum, AHF, vt 19.
ad 37. & ſic deinceps, prout indicat ſeries numerorum ſupra poſi-
ta, quod demonſtrandum erat.
COROLLARIV M.
_H_Inc patet ſi expoſita ſint ſpirales in quotcunque reuolutionibus
genitæ, initio circulationis exiſtente in, K, ſint autem volutæ
ipſæ, KL, LO, OP, PG, &
ſpirales eodem ordine procedentes, KRL, L
SO, OTP, PVG, quod ſi, KG, fuerit æqualis ipſi AE, &
diuiſa in pun-
ctis, L, O, P, prout diuiditur, AE, in punctis, B, C, D, ſpatium, KRL,
11_Elicitur e@_
_9. huius._
_Elicitur_
_15. huiur._
erit æquale ſpatio, AIN, &
, LSO, trilineo, AMN, & , OTP, trili-
neo, AMH, &
tãdem, PVG, trilineo, AHF, & ſic deinceps, vnde
etiam hæc ſpatia ſe habebunt, prout indicat ſuprapoſita ſeries nume-
Secunda ſeries num. 1. 6. 12. 18. 24. 30. 36.

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