Newton, Isaac, Philosophia naturalis principia mathematica, 1713
page |< < of 524 > >|
Secent enim circuli duo primi FSG, FTHſe mutuo in K.
Jungantur
PK, QK, RK, a K, b K, c K,& producatur QPad L.
Anguli
ad circumferentias FaK, FbK, FcKſunt ſemiſſes an­
gulorum
FPK, FQK, FRKad centra, adeoque angulorum
illorum
dimidiis LPK, LQK, LRKæquales. Eſt ergo Figura
PQRKFiguræ abcKæquiangula & ſimilis, & propterea abeſt
ad
bcut PQad QR,id eſt, ut ABad BC.Angulis inſuper FaG,
FbH
, FcIæquantur fAg, fBh, fCiper conſtructionem. Er­
go
Figuræ abcFGHIFigura ſimilis ABCfghicompleri poteſt
Quo
facto Trapezium fghiconſtituetur ſimile Trapezio FGHI
& angulis ſuis f, g, h, itanget rectas ABC, AD, BD, CE
q
.E.F.

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