Barrow, Isaac, Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur

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8668 hoc eſt σ π. RN: : PA + 2 NA. NA. eſt autem arc σ π. RN
:
: ſubtenſa σ π. RN: : π ZZ R: : π Z. ZN. ergo π Z. ZN: :
PA
+ 2 NA.
NA. & componendo π N. ZN: : PA + 3 NA. NA
&
antecedentes ſubduplando FN. ZN: : {PA + 3 NA/2}. NA. de-
nique
dividendo FZ.
ZN: : {PA + NA / 2}. NA. eſt autem EA =
{PA + NA/2}.
ergò tandem eſt FZZN: : EA. NA: Q. E. D.

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