|o DE FORMVLIS 



zf ^/{aa-jj- iaa~xx) "^v^J 'M ^ VCJa-//) ° ^ M / 



hincque .... /(aa-xx^dxACm. ^^^^^^^^ 



- {aax-lx^)Ai:m.^—-'^a^Ai:in.^^^—,^ 



'^^fi3aa+ff)A{in.^_-jj-^-^ifxy{aa--ff-xx). 



Qiiare pofito jf=::CD— ^, erit foliditas portionis 

 fphaerae redangulo C D E F infiftentis : 



Ufy(aa-ee-ff)^^if(aa-ff).A{in.,^^-^^,e(3aa-ee) 



Afin.^3^-^a^Afin. ,,,J^,^^_^,, -^ Uf{2 a a -ff) 



Afin.^-^,4- U ef V{aa-ee-ff) 



qime expreflio reducitur ad hanc : 



\efV{aa-ee-f )-{-', f[:iaa-ff)Arm.^^^'^^^-^''^e{:^aa-ee') 



13. Si ergo redanguli terminus F vsque ad 

 peripheriam pcirrigatur vt fit ee->rff~aa^ pri.- 

 mum membrum euandcit et arcus c rculires tria 

 Mliqua aSkientes abeunt ia- angulum redum feii f^ 



eritque foliditas 



1 ( ,' tf ^ ^ H- \aaf- i / - 1/^ - ^ a' ) 

 feu ohfzzV(aa — ee) 



^i{{ 2aa-\-ee)V{aa-ee)—2a'^:^aae.—e^y\ 



quod. folidum fit maximum , Hfzzezz—.^ fitque" 

 id tum ^"^-zij^^ dum folidiias oaantis fphae- 

 rae eft —'^a^ lia vt noftrum folidum fit ' aj 



odaa- 



