( '7 ) 
H F = b, 8c C h = x. Turn ex natura figure erit 
b x 
e h = - — 9 & particula p fita ad pun&um z erit ut x ; vel 
<£ 
Potius, fa&o h z = v, erit v x elementi prifmatici bafis, 
8c p erit ut v x x. Unde erit C = C zq : kvxx = vxx 3 
•fir v 2 x. Ideoq$ fumma omnium C z q : x p in lined 
h z erit v % x3 -f 
bx 
X v3 
nendo 
3 
bx\ 
— ) eri 
a / 3 a1 
■ y 8c in lined e f (pro v po- 
• r ... 6 b a 2 -f -2 b^ . 
ent fumma ilia r * x x*. Unde 
iteium capiendo fluentem, Sc pro x fcribendo a, erit 
Eft autem pyramis ipfa A. 
^ 6 b a 2 -f 2 b? 
C = • x a 
i5 
2 bf 3 a 
= — - a 8c diftantia centri gravitatis C a vertice C 
eft C G = — a. Unde - — CGq: =~ =CGkGO 
4 A 1 A 
2 a 2 4- id b 2 
= d . 
So 
Ex, 2 . Sit figura propofita Conus re&us defcriptus ro- 
tatione trianguli ifofcelis E C F circa perpendiculum 
CH. 
Hie iterum fumpto vertice C pro centro fufpenfionis, 
8c fattis C H = a, HE = b, C h = x, h z = v, ut 
. . . , b b , • * 
fupra j ent p = 2 x v x v — x x — v v , unde C — 2 v x 
vv , V-sx-vv. Sit B fegmentura cir- 
xx*T vv aa 
culi diametro e f deferipti, quodadjaeet Abfcilfe hr - v } 
q & Or* 
