( *8 ) 
jj, 
& Ordinatas y — x x — vv; turn erit fumma omnium, 
aa 
C zq : x p in refta hz = 2 x x ^ ^ x * 2 * 4 5 & B — \ i y 
4 a 2 
b 2 
H — X ' 
a 2 - 
Et quando v — eh,, erit haec fumma- 
2 x « x 2 B 5 cujus duplum ^ — - x x 2 B eft 
pars ipfius C in reft a e f. Eft autem area B ut x 2 5 fit 
4 a 2 4- b 2 
ergo B = c x 2 ; atq$ pars ilia ipfius C erit - - — . x 
2i 
A . 
* c j x^.U'nde capiendo fluentem erit C=- x . c a 3 < 
5 
Eft autem conus ipfe A = f c a3, 8c C G, ~ i a.. Unde.? 
c „„ D_3» 2 -t- iab 2 - 
A-CGqi^A U — 
Atcft ad hunc modum procedit calculus in alijs figuris, 
ubi rationes C h ad h e, & h z ad p funt magis com** 
pofitse.. 
Ex. 3, lit pateat ratio calculi quantitatis D, fit figura 
propofita parallelepipedon, 
cujus facies Horizonti per- 
pendicularis,& parallela pla- 
no motds centri gravitatiseft 
A B D. Due diametros E F 
& H I, & Ht altitudo ele- 
mentorum p, 2 : & fit t r pa- 
rallela H i 5 & GF = a, 
QH = b, Cs = X)8csz = v. Turn erit d = v x x x 
4- x v v v. Unde ipfius D pars in refta tr erit 2 bi x s 
4 ’i>3 x satqi iterum fumendo fluentis duplum, erit : 
D 
■■ 1 
G 4 
