Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1dio) ut BWad BV,ſeu AO+ORad AO,id eſt (cum ſint CA
ad CO, COad CR& diviſim AOad ORproportionales,) ut
CA+COad CAvel, ſi biſecetur BVin E,ut 2 CEad CB.
Proinde
, per Corol.
1. Prop. XLIX, longitudo partis rectæ Fili PT
æquatur
ſemper Cycloidis arcui PS,& Filum totum APTæquatur
ſemper
Cycloidis arcui dimidio APS,hoc eſt (per Corol. 2. Prop.
XLIX
) longitudini AR.Et propterea viciſſim ſi Filum manet ſem­
per
æquale longitudini ARmovebitur punctum Tin Cycloide
data
QRS. que E. D.
Corol.Filum ARæquatur Semicycloidi AS,adeoque ad ſemi­
diametrum
ACeandem habet rationem quam ſimilis illi Semicy­
clois
SRhabet ad ſemidiametrum CO.
PROPOSITIO LI. THEOREMA XVIII.

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