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# Title: Qua Continentur De Angulo Contactus & Semicirculi, Disquisitio Geometrica. De Sectionibus Conicis Tractatus. Arithmetica Infinitorum: sive de Curvilineorum quadraturâ, &c. Eclipseos Solaris Observatio (shelfmark Leibn. Marg. 84:2)
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De Sectionibus Conicis.
PROP. 26.
applicacae cum expolica diametros) ipE93 AS parallela pona-
cur aB = Aa = 1, angulum Faciens AaB =SAa: (Calcem Can.
eae sinc longicudinis AS, aB, uE sIE AS LaB =113 modo incerim
non sinc AS, aB, invicem aequales; eo enim calunon Conus, led
C.glindrus prodirec:) EC jungancur rectae 85, BA, quae conci
nuaca coeane in V, complences criangusum VaB, (E nempe
aE ajOP HE quam AS, prouc jam supponimus; vel, A leCUS,
eriansulum VAS:) quod esto criansulum per axem C oni mOk
corltruenai.
Deinde Super rectas Aa, 2B, duo plana ica erisaneur ut com-
munis earum lectio ao taciae cum recta aB angulum rectum,
cum recta vero Aa angulum aequalem angulo inclinationis FI
lipleos propolitx. Hoc enim ommino teri posse constat: Si e-
nim erisacur in puncto a recta aco, quae sic recta plano erianguli,
(adc09; utrolq; angulos cnA, caB, rectos Faciat per 3d 11p)
circumvolvatur circa rectam aB uc axem, invariaro angulo
caB, donec ad licum plani VaB perreniat, Faciacq: in plano eri-
anguli ansulum coaA acutum; quiminor erit anculo (acuros
incellige, nih urerq; rectus lic,) inclinacionis Bllipleos exposi-
Ex, (cum sIC, ex constructione, angulus AaB complemenco in-
clinacionis major;) necesse ekut in erantieu aliquando fecerie
angulum, inclinarionis ansulo aequalem, (Factus enim eseran-
sirus ab ansulo recto, adcog; debito majori, vel Calcem aequali,
ad angulum dehuco minorem;) adeoq; cunc fuerit im situ debi-
c0