tndc fit 



Area nSZ~' z yy fm. (0 - ^(i + cof. (0 - jjl)) 



eodemque modo deprehenditur fore aream feetoris 



n s 7J - \yy ai p - ^) (2 4- cof. (v - p.». 



§. 14. Ad angulum p. elidendum, cum fit an- 

 gulus Z S Z' - II S Z' - n S Z, ponatur 



(0'-JJl)-(0-fl.) = 0'-0:=2V, 



eritque 

 Statuatur iam 



cof.:(y-ri __ y _ £ 

 coi.i(0-p.) - y y~«' et ob 



cof. 1 (0 — jx) — « cof. ; (0' - jjl) , erit 

 cof. 5 (0 - fji.) — u cof. 1 (0 - p.) cof. y - u fin. s (0 - jul) fin. y, 

 vnde fit 



tang. J (• - |i) = Hfeffl 

 confequenter 



fin. 5 (0-fJL) = *- c ^-^ e t cof.!(0-jjL) - 5te f 

 pofito breuitatis gratia 



V(««+i-2a cof. v) = 2;. 

 Hinc erit 



fin. (0 - (jl) = hl^ ^^" -') et 



cof. (0 - jjl) — ."«J»^*-'-*, 



adeoque 



2 _|- COf. (0 - jjl) — ""^ + l? , 



hisquc valoribus fubftitutis fiet area fectoris' 



n c 7 — y y u f tn ' v fa co /- v — 1) (« u u j't. v- -f- « «) 



§. 15. 



