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

Table of contents

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[451.] THEOREMA XXVI. PROPOS. XXVIII.
[452.] COROLLARIVM.
[453.] THEOREMA XXVII. PROPOS. XXIX:
[454.] A. COROLL. SECTIO I.
[455.] B. SECTIO II.
[456.] C. SECTIO III.
[457.] D. SECTIO IV.
[458.] E. SECTIO V.
[459.] THEOREMA XXVIII. PROPOS. XXX.
[460.] A. COROLL. SECT IO I.
[461.] B. SECTIO II.
[462.] C. SECTIO III.
[463.] D. SECTIO IV.
[464.] E. SECTIO V.
[465.] THEOREMA XXIX. PROPOS. XXXI.
[466.] THEOREMA XXX. PROPOS. XXXII.
[467.] COROLLARIVM.
[468.] THEOREMA XXXI. PROPOS. XXXIII.
[469.] THEOREMA XXXII. PROPOS. XXXIV.
[470.] COROLLARIVM.
[471.] THEOREMA XXXIII. PROPOS. XXXV.
[472.] COROLLARIVM.
[473.] THEOREMA XXXIV. PROPOS. XXXVI.
[474.] THEOREMA XXXV. PROPOS. XXXVII.
[475.] THEOREMA XXXVI. PROP. XXXVIII.
[476.] THEOREMA XXXVII. PROP. XXXIX.
[477.] THEOREMA XXXVIII. PROP. XL.
[478.] COROLLARIVM.
[479.] THEOREMA XXXIX. PROPOS. XLI
[480.] THEOREMA XL. PROPOS. XLII.
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469449LIBER VI. ſpatium, OP℟, erit vt omnia quadrata, MG, regula, MI, ad om-
nia quadrata trianguli, TLC, eſt autem idem ſector, AOQ, ad ſpa-
tium, OP℟Q, vt omnia quadrata, MG, ad omnia quadratatrian-
guli, MIC, regula eadem, ergoſector, AOQ, ad reliquum ſpa-
tium, dempto ſpatio, OP℟, à ſpatio, OP℟Q, erit vt omnia qua-
drata, MG, regula, MI, ad omnia quadrata trapezij, MILT, ſed
1128. 1. 2. hæcſunt, vt quadratum, GT, adrectangulum, GTL, cum {1/3}.
qua-
drati, LG, ergo, conuertendo, ſpatium, ℟OQ, ad ſectorem, AOQ,
erit vtrectangulum, AO℟, cum tertia parte quadrati, A℟, ad qua-
dratum, AO, quod erat oſtendendum.
THEOREMA XIII. PROPOS. XIII.
IN eadem antecedentis ſigura centro, O, diſtantia, O℟,
deſcripta circumferentia, ℟Y, oſtendemus trilineum,
A℟Q, ad trilineum, ℟QY, eſſe vt, ℟O, cum {2/3}.
℟A, ad, ℟
O, cum tertia parte ipſius, ℟A.
Quia enim ex antecedenteſector, AOQ, ad ſpatium, Q℟O, eſt
vt quadratum, AO, ad rectangulum, AO℟, cum {1/3}.
quadrati, A ℟,
per conuerſionem rationis, idem ſector ad trilineum, A℟Q, erit vt
quadratum, AO, ad rectangulum, O℟A, cum {2/3}.
quadrati, ℟A, nã
dempto rectangulo, AO℟, à quadrato, AO, remanet rectangulũ,
OA℟,.
i. rectangulũ, O℟A, cum quadrato, ℟A, à quo ablato {1/3}. re-
manet rectangulum, O℟A, cum {2/3}.
quadrati, ℟A, ideſt cum re-
221. Secundi
Elem.
ctanguloſub {2/3}.
℟ A, & ſub, ℟A, quod cum rectangulo, O℟A, cõ-
ficit rectangulum ſub compoſita ex, O℟, &
{2/3}. ℟A, & ſub, ℟A,
conuertendo igitur trilineum, A℟Q, ad ſectorem, AOQ, erit vt
33Coroll. 2.
3. huius.
rectangulum ſub compoſita ex, O℟, &
{2/3}. ℟A, & ſub, ℟A, ad qua-
dratum, OA, inſuper ſector, AOQ, ad ſectorem, ℟OY, eſt vt qua-
dratum, AO, ad quadratum, O℟, &
quia idem ſector, AOQ, ad
ſpatium, Q℟O, eſt vt quadratum, AO, ad rectangulum, AO℟, cũ
{1/3}.
quadrati, ℟A, ideò ſector, AOQ, ad reliquum dempto à ſpatio,
℟OQ, ſectore, ℟OY, ideſt ad trilineum, Q℟Y, erit vt quadratu,
443. Secundi
Elem.
AO, ad reliquum rectanguli, AO℟, cum {1/3}.
quadrati, ℟A, ab eo
dempto quadrato, ℟O, ideſt ad rectangulum, O℟A, cum {1/3}.
qua-
drati, ℟A, erat autem trilineum, A℟Q, ad rectorem, AOQ, vt re-
ctangulum ſub compoſita ex, O℟, &
{2/3}. ℟A, ad quadratum, AO,
ergo ex æquali trilineum, A℟Q, ad trilineum, ℟QY, erit vt rectã-
gulum ſub compoſita ex, O℟, &
{2/3}. ℟A, & ſub, ℟A, ad rectangu-
lum, O℟A, cum 3.
parte quadrati, ℟A, ideſt ad rectang. ſub

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