hincque diipliirn trianguli 



F M C = M jui. FCz=/)tf. -liL^.-s, 

 ec dupla diffcrcntia horum triangulorum 



^ ^ 1 -I- f co/ $ i -f- e eoj. 4> ' 



Tum vero habcbitur 



FanFMcof.MFBr: — FMcof.AFM = -._lL2Ll- Ct 



' I -t- tf c<y.$ 



C/JL=:F/JL — FC=:~ -L^^ — a e 



___ ,,.^cor.q^, ob /)=:a(i — ^n. 



Hinc quum fumto CA pro finu toto, fit C ju, coflnus arcus 

 Aw, hibebicur cof. A;/;:z= °' ''-^"■ ■. ^' et angulus 



7 I — r- 6 COJ , vp ' '^ 



A C w = ang. cof. -1-^-^^, quare fiet feclor 



^ I -I- f Co_,i . Cp ' 1 



ACw — \a* Arc. cof. (.liiSaL^) ct fedor 

 A C M z:r 1 «V (I — ^') Afc. cof. (^^:^^) , 



eademquc ratione fedor 



A C N = ■■aV(i -^O Arc. cof. (^:±^), 



proinde fecflor 



NCMriflV (i-^')[Arc.cof.(J:±i:i^)-Arc.cof.(:=±i^)], 



ct fciflor N F M = fedori 



N C M -I- A F N C — A F M C =z 



j fl' / ( I - f ) [ Arc. cof ( Jl±-i^ ) - Arc cof. ( Jl±£2^ ) ] 



• ^ ^ ^ I , * fj,..p 1 -r- e co . |K -^ 



Vnde nunc planum fit quid finguhic ifta cxprcflloncs Aualy- 

 titac in ^. 12. alhitae defigncnt. 



X 2 §. 17« 



