Archimedes, Archimedis De iis qvae vehvntvr in aqva libri dvo

Table of contents

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[11. PROPOSITIO IIII.]
[12. PROPOSITIO V.]
[13. PROPOSITIO VI.]
[14. PROPOSITIO VII.]
[15. POSITIO II.]
[16. COMMENTARIVS.]
[17. PROPOSITIO VIII.]
[18. COMMENTARIVS.]
[19. PROPOSITIO IX.]
[20. COMMENTARIVS.]
[21. ARCHIMEDIS DE IIS QVAE VEHVNTVR IN AQVA LIBER SECVNDVS. CVM COMMENTARIIS FEDERICI COMMANDINI VRBINATIS. PROPOSITIO I.]
[22. PROPOSITIO II.]
[23. COMMENTARIVS.]
[24. PROPOSITIO III.]
[25. PROPOSITIO IIII.]
[26. COMMENTARIVS.]
[27. PROPOSITIO V.]
[28. COMMENTARIVS.]
[29. PROPOSITIO VI.]
[30. COMMENTARIVS.]
[31. LEMMAI.]
[32. LEMMA II.]
[33. LEMMA III.]
[34. LEMMA IIII.]
[35. PROPOSITIO VII.]
[36. PROPOSITIO VIII.]
[37. COMMENTARIVS.]
[38. PROPOSITIO IX.]
[39. COMMENTARIVS.]
[40. PROPOSITIO X.]
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FED. COMMANDINI
do in reliquis figuris æquilateris, & æquiangulis, quæ in cir-
culo deſcribuntur, probabimus cẽtrum grauitatis earum,
&
centrum circuli idem eſſe. quod quidem demonſtrare
oportebat.
Ex quibus apparet cuiuslibet figuræ rectilineæ
in circulo plane deſcriptæ centrum grauitatis idẽ
eſſe, quod &
circuli centrum.
Figuram in circulo plane deſcriptam appella-
γνωρ@ μω@mus, cuiuſmodi eſt ea, quæ in duodecimo elemen
torum libro, propoſitione ſecunda deſcribitur.
ex æqualibus enim lateribus, & angulis conſtare
perſpicuum eſt.

THEOREMA II. PROPOSITIO II.

Omnis figuræ rectilineæ in ellipſi plane deſcri-
ptæ centrum grauitatis eſt idem, quod ellipſis
centrum.
Quo modo figura rectilinea in ellipſi plane deſcribatur,
docuimus in commentarijs in quintam propoſitionem li-
bri Archimedis de conoidibus, &
ſphæroidibus.
Sit ellipſis a b c d, cuius maior axis a c, minor b d: iun-
ganturq́;
a b, b c, c d, d a: & bifariam diuidantur in pun-
ctis e f g h.
à centro autem, quod ſit k ductæ lineæ k e, k f,
k g, k h uſque ad ſectionem in puncta l m n o protrahan-
tur:
& iungantur l m, m n, n o, o l, ita ut a c ſecet li-
neas l o, m n, in z φ punctis, &
b d ſecet l m, o n in χ ψ.
erunt l k, k n linea una, itemq́ue linea unaipſæ m k, k o:
&
lineæ b a, c d æquidiſtabunt lineæ m o: & b c, a d ipſi
l n.
rurſus l o, m n axi b d æquidiſtabunt: & l m,

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