Casati, Paolo, Terra machinis mota : dissertationes geometricae, mechanicae physicae hydrostaticae

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1triangulum FEG, cuius latus FE datur, an­
gulus EGF æqualis angulo EAC obſeruato
innoteſcit propter linearum CA, FG paral­
leliſmum, & GEF eſt complementum ad
duos rectos anguli FED obſeruati.
Inuenia­
tur itaque latus EG; quod ablatum ex EA
diſtantiâ iam notâ duorum locorum, iņ
quibus inſtitutæ ſunt obſeruationes, relin­
quit GA.
At in triangulo EAC, lateri AC
parallela eſt GF, ergo vt EG ad GA, ita EF
data altitudo ad FC quæſitam ſemidiame­
trum.
Vel etiam ijſdem poſitis, & obſerua­
tis angulis CED, GAE, atque diſtantiâ AE,

in triangulo CAE noti ſunt duo anguli, (an­
gulus ſiquidem CEA eſt complementum ad
duos rectos anguli CED obſeruati) & latus
adiacens AE: inueniatur igitur latus EC, ex
quo dempta nota altitudo FE relinquit quæ­
ſitam terræ ſemidiametrum.
Erit autem
indicium ſufficientis diſtantiæ inter A & E, ſi
angulus CED obſeruatus fuerit maior angu­
lo CAE.
LI.
Octaua me­
thodus in­
ueniendi ter
ræ ſemidia­
metrum.
LII.
Idem aliter.
Gal. Ea profectò ſunt, quæ hactenus di­
ſputata ſunt, vt vix cenſeam fieri poſſe, vt
alicui nulla ex his methodis arrideat.
Ve­
rùm ſcrupulus eſt, quem fortaſſe ex multo­
rum animis non facilè eximas: exiſtima­
bunt ſiquidem angulum, quem cum per­

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