aao^. . - SOUTIO 



tKiQe — e\ fin. fCGznfin. 2^ ct cof. ^CGzr/— cof. a^, 

 \nde fit tang. C f G rz ;— Jy^gTTi quac :cft exprcflb ante 

 pro tiing. j(J) inucntj. Erit er^o C^G — sCp, angu- 

 lotjiic CrG bifcdo pcr ^H crit anguliis C^H ciqiie acqua- 

 lis ECI~4). Vndc rcdli CI erit pofitio alterius axis , 

 ciqiic normalis CK dabit pofitioncm altcrins. Dcindc rcda 

 IhK per Pl ipfi CF p.ir:illd;i dnd.T eft tangens cUipfis io 

 E , quare (i cx E in \tunnquc axem pcr|iendicula E L, 

 E M dcmittiintur , fcmiaxis C A crit mcdia proportionilis in- 

 tcr CL ct CI , ittmquc (cminxis C B mcdia proportionalis 

 inter CM ct CK , pianc vti conftrudio liabet. 

 F'6 s- Vro II. Covjlrudknc. Ob trinngulum CED ifosce- 



Its et nnguhim ECDrr.KDC— ? erit nng : CFDn iSo°- 2^. 

 Dcinde ob ECr^^ , EG — E HzrCFr:i/, quia Gl ipfi 

 CH cft parallcb, crit EI— •^". Porro eft tangensEClz= 

 cf^^^f^lfED trgo ob fin. CEDrr fin. 2 ^ ct cof. 



CED:;ii— cof. aO habcbitur tangcns ^Clz:: r,'^]}ih(mi 

 eritquc crgo ECI^^Cj); vndc liimta CKii.:CE — ^ , 

 bifcdaquc EK in M, rt«f^a CM angulum ECKrri^CP 

 bifccabit , it.i \t fit ECMnCp, idcoque CMAP pofi- 

 tio akerius axis , cuius (imilVis (]uanritas CA vt antc dtfi- 

 nitur , et dctciminjtio alierius ftmiaxis C U cx ipla con- 

 ftructiune eft manifcfta. 

 jr^ 3 Fro III. QonllrucUonc. Ex ratione pracccdentis coii- 



ftrudionis intclligitur rtdam CU angulum ECl bifccan- 

 tcm darc pofitioncm axis tranMicrfi. Cum igitur fit CE~f , 

 Elrzf ct CEI-iSo^-^e ct crit CI-y(CE'-H 



Er-aCE.Elcof CEl)=rr(f^-i-^4-2/cor 2O 

 x:\y\e*^J *^-zeeJ) cof 2^}. 



Hinc 



