Pr in tot partes icquales quot funt wnirates in 

 n , quarum illa quae punfto P adjaeet ik P A. 

 Fafto initio in pun&o A dividatur integra cir- 

 cumferentia in tot partes aiquales AB, BC , C D, 

 DE, &c, quot funt unitates in n, (iimttque in radio 

 OP produ8:o (i opus, abfcifia OSziz, jungan- 

 tur SA, SB, SC, SD, SE, &c, ut & OA, 

 OB, OC, OD, OE, &c. Sumantur arcus 

 PAa, PBb, PCc, PDd, PEe, &c , qui fint 

 ad arcus PA, PB, PC, PD,PE, &c, ut r ad i, 

 & a punftis a, b, c, d, e, &c demittantur ad 

 diametrum P p normales a^t, b/3, cy, di", Cf 8zc. 

 Prsterea (umantur ordinc tot arcus xquales 



Pr, rr, r r, rr, &c, quot unitatcs cdritTnet fra8:i6 

 r — I 



5 &addiametrum Pp deducantur normaleS 



n \ 



II II II IU III \ 



r R , r r &c. His faStis area curvae cujus 



z*' + — ' 



abfbifla eft s & ordinata 5 erit 



I — qz'' +2= 



n 



41 ~ I/ II 



Rr, Rr ^ R r Rr 

 in I : r zz: r ' : 



Rr r-r~?Lz" r — i^i.z-" r — ^v.z^^" r — ^n. 



f— a^ (SA: AO)— O^(SAO) 

 — bS (S B : B O) — 03 ( S B O ) 

 I Wcy (SC: CO) —Oy ( S C O) , 



+ TTRr \'\~^^" (SI^: ^O) H-Oc^ (-SDO) 

 "^^^ _ee (SE: £0) 4- O e (— SEOj 

 [ &c. &c. 



I I II II m III 



Refe i^r, i?r, Rx.Rr &c, ut &moduli ra- 

 tionum a-t, b,/?, cy, d<^, ee &c ligna habent af- 

 iirmativa fi a femicirculo P r p in diamctrum ca- 



O ^ dunt. 



