( 48 1 *. 
adjacet fit P A. Fado initio in pundo A dividatur -In- 
tegra circumferentia in tot partes asquales AB, B C, 
C D, D E, £fc, quot funt unitates in n ; fumtaque in ra- 
dio O P, prod udo (I opus ultra P, abfciffa O S = a . — \ 9 
a I 
jungantur S A, SB, SC, SD, SE, &c. ut5 cOA, 
O B, OC, O D, OE, Denique fumantur areus 
PA a, P B b 9 P C c 9 P D d, P E^. &c. qui fint ad 
arcus P A, PB, PC, P D, P E, &>c. ut n -f r ad 
unitatem, 6c a pundis a y b 9 c y d , e 9 &fc. ducantur 
turn redae a cc, b€, c y, d JN, ei> £fc. parallels radio 
OP 6c oceurrentes re&se OR in pundis a, £, y 9 <p 9 g, 
&c. tumetiam redae a 1, bz, c 3, d 4, e 5, &c. pri- 
oribus normales, 5c redae QO, quae ad R O ducatur 
perpendiculars, oceurrentes in pundis i 9 z, 3,4, 
His fadis area curvae cujus abfciiTa eft z 6c or- 
dinata 
c z 
1 v 
a,** ~i: 1 b z» z z ent n ^ 
m 
. c » 
4 a 
A 
-r t — n —• I 
f — act (S A : A O) — ^i(-f-SAO)'j 
+ b S (S B : B O) +£2(4- S BO) 
in< — (SC:CO)+* ,(+SCOA 
+ i^(SD:DO)~^ 4 (-SDO)[ 
+ e 1 (S E ■: E O) +e 5 (— SEO)J 
&c. ' &c. 
Et 
/ 
