176 MEDITATIONES DE QFANTITAJ IBrS 

 IV. Dcnique pro arca Dti y ita inferendiim : 



2)?ll.Ug=lo^ rj^L 



adccxiuc PH : [PH-H//]^ ^d" : [^D^ - f° J ^^ii aream y 



h. e. I :(i-4) =^-3-pDn--L-3-p°H-^-^-3-pOH)J 



(ai I : -3 :^-3 : [-3-4.(-3)] leu (-3+1 ^— + 



F G 



E(l crgo arca Dti y — H" 9 > qualium eft pD„ — -\- i. 



Tandcm arcis Dtornm a , p , y et 5 ad idcni puncflum 

 P couiugatorum iuucntis , intus quoquc cuiuslibct facilc 

 exprimi potcft , modo notctur , pcr latus quadrati in hoc 

 negotio pcrpetuo radiccm quadratam arcae quadratac in- 

 tclhgcndum enb. Eft namque 



Latus Dti a=ry[PQ^.PR]=-+-y[-{-3.-t-3]=-f V-^9--h3. 



Latus Dti Y-V[P^.Pr]-.y[-PQ.-PRl=:-y[-3.-3]rr-V+9r::^-3,^ 

 formuhe y[— 3.— 3] pracfigitur fignum — , ad fitum quadraion 

 y et a oppofitum fignificandum. 

 Latus Cti (3=:y[PQ.Pr]=ryfPQ..-PR]=:-t-y[-^3.-3]--Hy-9- 

 L.uns Dti 5rrV[PR.P(7]-y[PR.-PQ.]zr-V[-h3-3]=-V-9, prol 

 fcilicct Dti 5 , ipfi (3 oppofito , fignificando. 



§. 8. Hic fatis fpcciofe obiici rntcft » tiusmodi r.idi- 

 ccs .vmH^V-a', c. g. — ^V-9, clTe mere ima- 

 ginarias , impolfibilcs , ct in;iifignHbiks , propttrca qnod 

 nullo modo radix quadrata cxtrahi portit : ncc 



cnim 



cx - tf 



