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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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Arithmetica Infinitorum.
DROP. LZV I.
Theorema.
iX cognita quantitate seriei alienjus integrae, c08
nolcitur quantitas ejuldem obtruncatae.
Puca, Si A B Triangulum sic Z A B ParraHelOgraM-
mi; e a 6 Frianeulum, Z a 6 Paralleloeromni: crit
residuum Traverium, = AB  Z a 6. Icem A B Parabola:
AB parallelogrammi circum (cripei; de a B Parabola Z a B Paral.
delosrammi circum Ccripei: erie residuum, E AB  Z aB. Et
Pacirer in aliis.
PROD. LXVII. Corollarium.
CTTrianculum rectis quotlibet secetur basi parallelis, 
agnaliter ab invicem remotis, (portiones agné altas
abscindentibus) abseissa Triangula (verticem inter 
rectas secantes) sunt H
13 4393 16, OC. MHa
meri guadrati. Spacia
vero rectis illis interje-
Et a, Ut 13 33537, C.
rithmetice-proportio
nales.
Ouia Triangulorum
abscillorum eam alcicu-
dines quam Bales (unE 2
richmerice proportionales: ergo plana in duplicaca raci
one Rrichmetice proporcionalium, sire uc numeri quadeatiu L
439, 16, _C. Et Propcerea, Spacia incerjecta, 1, 3 = 4
3 = 9  4, 7 =- 16 = 9_C.
PROP. LXVIII. Corollariumo
T conus planis quoilibet secetur basi parallelis, e a
qualiter ab invicem remotis, (portiones aeque-altas
abscin
PrOP. 67.
Fie. Preced.