Fig- 2, 



D£ LVNVUS QJ^A-DKAmUBVS. j6^ 



§. 8. Sit Qiiadrans Cijrciili AEB, et Polus af- 

 fumatur in centro A^ erit voeatis AM — /^ AB — <7, 

 BCzri^, ANnz.^;, aequatio pokris liaec , a — t-^ qua- 

 rc pro Lunula z^ ~a'^ — iVV aa — uu\ affumatur P 



— ^7^"Ciii^), qno pofito Vdu integrari poterit ; atque 

 crit aequatio curuae quaefitae ::-—«- — ^rz^. Igitur con- 

 Itiuatur Paraboia , cuius parameter ~ ^ — B A , fiat \i\ ^'^- 3 • 

 ea BP--tt, erit ?k~a-u, et ?W^—a--au—z^:, 

 quare fada ANrrPM, erit N in Curna quaefita. Ab 

 initio Curuae , vbi«j~(?, eit;:^—*?, quare Lunula hacc 

 claufli erit in B \ fed in fine fit 2; — <? , ergo ibi Lu- 

 nula eft aperta; fit autem f?du — ^^-'"-=^. Vei pj^ ^ 

 potius , pro mueniendo pundo N , ponatur B O — BC, 

 et produ:atur radiiis BA in Diamctrum BD, deinde 

 radio ^OD defcribatur femi-circulus ORD, erit AR 



§. 9. Sit Parabola EM, in qua afiiimatur polus '^'s;- <• 

 m Axe A; et AB — ^, AM~f,BPz=.v, PM— j; 

 paramctcr Parabolae zi; 4. ^ , \t punctum A fit in Foco 

 Parabolae ; erit A B ( ^ ) : C B ( i^ ■— A M (t ) ; P M (^;' ) , hinc 



/=^-, nec non AB( ^)^AC( V^ ^-^^ j — AM( O: 

 A P ( ^ - .r ) , vnde x — ^-d^zE" ; igiuir ob 4. a x —y - , 



erit aequatio polaris ^a^ —-^a^^ty aa — uu zzit^ «^. 



vnde dediicitiir, fada P = ~^% et /P^«zif-^' , szn 



^° u ^~ : hit^ic ab initio, vbi?^ — <?, eft ^ — 00, in 

 fine vero , vbi uzza ., zzzzt. 



X la §. 10. 



