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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 Sectionibu conicis.
PROP. 5
celer nopvolu Trianculum (quod Triansulum opposs.
tum appellamus,) ita et Oppositum COnUM FOrMAEI
supponendum est.
eleragi in provosirione (prxeterquam quod Detinitionet
fint) per le lacis pacene, nec ulceriori cgene Demonstracione.
lnicum opus es, uc octendam, nempe Picuram solidam sic forma-
lam. (si C onum Distortum eximas,) talem Conum esse qualem de-
finit spetonius: Vel, quod idem ck, Parallelos circulos cont
notri parallelis Circulis coni Apollomii congruerc. Ouod
quidem verum eA.
Nam (propier parallelismum Circulorum, adeoq; et con
rum Diametrorum in eodem plano extictentium, istalq; Via-
mecros distantiis a vercice proportionales,) si latus altero-
erum, exposici Trianguli per axem, puca VB circumteracue
sccundum circuliunius (pura BafIs) Peripheriam cranhbiceri
bens (qui ubiq: suinc dittanciis a rertice proporrionales a batis
radio paralleli, adeoq;, durance cora circumductione, criangu-
lo quod Axecrianguli expolici, recta circumducta, _ batis ra-
dio comprehenditur, ubiq; aCComMOdatur) eoTamq; fixuram
deleriber