Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1
LIBER
PRIMUS.
LEMMA XXVI.
Trianguli ſpecie & magnitudine dati tres angulos ad rectas tot­
idem poſitione datas, quæ non ſunt omnes parallelæ, ſingulos ad
ſingulas ponere.
Dantur poſitione tres rectæ infinitæ AB, AC, BC,& opor­
tet triangulum DEFita locare, ut angulus ejus Dlineam AB,
angulus Elineam AC,
63[Figure 63]64[Figure 64]
& angulus Flineam
BCtangat. Super DE,
DF& EFdeſcribe
tria circulorum ſeg­
menta DRE, DGF,
EMF,quæ capiant
angulos angulis BAC,
ABC, ACBæquales
reſpective.
Deſcriban­
tur autem hæc ſegmen­
ta ad eas partes linea­
rum DE, DF, EFut
literæ DREDeodem
ordine cum literis
BACB,literæ DGFD
eodem cum literis
ABCA,& literæ
EMFEeodem cum
literis ACBAin orbem
redeant; deinde com­
pleantur hæc ſegmenta
in circulos integros.
Se­
cent circuli duo prio­
res ſe mutuo in G,ſint­
que centra eorum P&
queJunctis GP, PQ,
cape Gaad ABut eſt
GPad PQ,& cen­
tro G,intervallo Ga
deſcribe circulum, qui ſecet circulum primum DGEin a.Jungatur
tum aDſecans circulum ſecundum DFGin b,tum aEſecans cir-

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