Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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PROPOSITIO LXXI. THEOREMA XXXI.
Sint AHKB, ahkbæquales duæ ſuperficies Sphæricæ, centris
S, s,diametris AB, abdeſcriptæ, & P, pcorpuſcula ſita extrin­
ſecus
in diametris illis productis.
Agantur a corpuſculis lineæ
115[Figure 115]
PHK, PIL, phk, pil,auferentes a circulis maximis AHB,
ahb
,æquales arcus HK, hk& IL, il:Et ad eas de­
mittantur
perpendicula SD, sd; SE, se; IR, ir;quorum
SD, sdſecent PL, plin F& f:Demittantur etiam ad diame­
tros
perpendicula IQ, iqueEvaneſcant anguli DPE, dpe:&
(ob æquales DS& ds, ES& es,) lineæ PE, PF& pe, pf
& lineolæ DF, dfpro æqualibus habeantur; quippe quarum ra­
tio
ultima, angulis illis DPE, dpeſimul evaneſcentibus, eſt æ­
qualitatis
.
His itaque conſtitutis, erit PIad PFut RIad DF,
& pfad piut dfvel DFad ri; & ex æquo PIXpfad PFXpi
ut
RIad ri,hoc eſt (per Corol. 3. Lem. VII,) ut arcus IHad
arcum
ih.Rurſus PIad PSut IQad SE,& psand piut se
vel
SEad ique& ex æquo PIXpsad PSXpiut IQad iqueET
conjunctis
rationibus PI quad.XpfXpsad pi quad.XPFXPS,
ut
IHXIQad ihXiquehoc eſt, ut ſuperficies circularis, quam

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