DelMonte, Guidubaldo, In duos Archimedis aequeponderantium libros Paraphrasis : scholijs illustrata

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Ducantur pręterea à punctis KL ad latera perpendiculares
KM
KN KO KP, LQ LR LS LT. & quoniam anguli
KMA
LQE ſunt recti, ac propterea æquales, & KAM LEQ
ſunt
æquales, ut oſtenſum eſt; erit reliquus MKA reliquo
QLE
ęqualis, triangulumquè AKM triangulo ELQ ſimile.
vt
igitur AK ad KM; ſic EL ad L〈que〉 & permutando
ad
EL, vt KM ad L〈que〉 pariquè ratione oſtendetur triangu
lum
BKM triangulo FLQ ſimile exiſtere; eſſequè BK ad
FL
, vt KM ad L〈que〉 ſimiliterquè in alijs triangulis oſten­
detur
, ita eſſe Bk ad FL, vt KN ad LR; & Ck ad GL eſſe, vt
kO
ad LS; at〈que〉 kD ad LH, vt kP ad LT. quia verò AK
EL
, Bk FL, Ck GL, Dk HL in eadem ſunt proportione, vt
proximè
demonſtratum fuit; in eadem quo〈que〉 proportione
erit
kM ad LQ, & KN ad LR; & KO ad LS, at〈que〉 kP ad
LT
. ex quibus ſequitur centra grauitatis KL, non ſolùm ab
angulis
in eadem proportione diſtare; verùm etiam à late­
ribus
in eadem quo〈que〉 proportione diſtare.
Ita〈que〉 cognito,
quomodo
intelligar Archimedes centra grauitatis in ſimili­
bus
figuris eſſe ſimiliter poſita; nunc conſiderandum eſt præ
cedens
poſtulatum, quatenus nimirum oporteat grauitatis cem
tra
in ſimilibus figuris ſimiliter eſſe conſtituta.
Nam inti­
miùs
conſiderando hanc ſimilem horum grauitatis centrorum
poſitionem
, congruum, & neceſſarium videtur, ſimiles figu­
ras
ſecundùm eandem proportionem eſſe æ〈que〉ponderantes;
eademquè
ratione (ob earum ſimilitudinem) circa grauita­
tis
centra æ〈que〉ponderare, veluti ſi figuræ: AC EG (quarum
centra
grauitatis ſint KL) à rectis lineis PN TR vtcumquè
diuidantur
, quæ per centra KL tranſeant; dummodo in figu
ris
ſint ſimiliter ductæ; hoc eſt, vel latera, vel angulos in eadem
proportione
diſpeſcant: vt ſit AP ad PD, vt ET ad TH. æ­
〈que〉ponderabunt
vti〈que〉 partes PABN PNCD, veluti partes
TEFR
TRGH. & hæc non eſt ſimplex æ〈que〉ponderatio; ve­
rùm
etiam (vt ita dicam) ſimilis, & æqualis æ〈que〉ponderatio.
cùm
ſit ſecundùm eandem proportionem, quandoquidem
eſt
PB ipſi TF ſimilis, cùm triangula AKB ELF, AKP ELT,
BKN
FLR, ſint inter ſe ſimilia, quæ quidem efficiunt, figuras

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