Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1
Corol.1. Hinc ſi agatur BCſecans PQin r,& in PTcapiatur
Ptin ratione ad Prquam habet PTad PR:erit Bttangens
Conicæ
ſectionis ad punctum B.Nam concipe punctum Dcoire
cum
puncto Bita ut, chorda BDevaneſcente, BTtangens eva­
dat
; & CDac BTcoincident cum CB& Bt.
Corol.2. Et vice verſa ſi
46[Figure 46]
Btfit tangens, & ad quod­
vis
Conicæ ſectionis punc­
tum
Dconveniant BD,
CD
; erit PRad PTut
ut
Prad Pt.Et contra,
ſi
ſit PRad PTut Prad
Pt:convenient BD, CD
ad
Conicæ Sectionis punc­
um
aliquod D.
LEMMA XXI.

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