288 ŒUVRES DE FERMAT. - I" PARTIE. 



a'quadir roctangulo sub !('■ in VO sivc roctangulo sub IH sive VX in \() 

 bis : orgo siiinina reclanguloruin sub PI in IK et sub GY in eamdcm IK 

 ipquatur roctangub) sub diamotro EL in VN ot roctangulo sub VX in 

 VO bis. 



Uectanguhi auteni omnia sub diamclro et porlionibus tangentium VN 

 in qnadranti' cirouii LVA ductaruni repra'scntant reclangulum sub 

 dianietro in quadranlem LVA, boc osl dupkun seniicirculi LAE; rec- 

 tangnbi autem omnia sub VX in VO bis sive, ductâ OZQ paralleb'i 

 diamètre, rectangula omnia sub VX in XZ bis reprsesentant totuni 

 semicirculum LAE. 



Ergo spatium cissoidale, quod aiquatur duobus illis rectangulorum 

 seriebus, aequatur triplo seniicirculi, ut patct. 



