Commandino, Federico, Liber de centro gravitatis solidorum, 1565

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1triangulum mkφ triangulo nkφ. ergo anguli lzk, ozk,
m φ k, nφk æquales ſunt, ac recti.
quòd cum etiam recti

ſint, qui ad k; æquidiſtabunt lineæ lo, mn axi bd.
& ita
demonſtrabuntur lm, on ipſi ac æquidiſtare.
Rurſus ſi
iungantur al, lb, bm, mc, cn, nd, do, oa: & bifariam di
uidantur: à centro autem k ad diuiſiones ductæ lineæ pro­
trahantur uſque ad ſectionem in puncta pqrstuxy: & po
ſtremo py, qx, ru, st, qr, ps, yt, xu coniungantur.
Simili­
8[Figure 8]
ter oſtendemus lineas
py, qx, ru, st axi bd æ­
quidiſtantes eſſe: & qr,
ps, yt, xu æquidiſtan­
tes ipſi ac.
Itaque dico
harum figurarum in el­
lipſi deſcriptarum cen­
trum grauitatis eſſe pun­
ctum
k, idem quod & el
lipſis centrum.
quadri­
lateri enim abcd cen­
trum eſt k, ex decima e­
iuſdem libri Archime­
dis, quippe cum in eo om
nes diametri conueniant.

Sed in figura albmcn

do, quoniam trianguli
alb centrum grauitatis

eſt in linea le: trapezijque; abmo centrum in linea ek: trape
zij omcd in kg: & trianguli cnd in ipſa gn: erit magnitu
dinis ex his omnibus conſtantis, uidelicet totius figuræ cen
trum grauitatis in linea ln: & ob eandem cauſſam in linea
om.
eſt enim trianguli aod centrum in linea oh: trapezij
alnd in hk: trapezij lbcn in kf: & trianguli bmc in fm.

cum ergo figuræ albmcndo centrum grauitatis ſit in li­
nea ln, & in linea om; erit centrum ipſius punctum k, in

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