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��ExcERPTA Mathematica.
��VI
��a — y, ^ tune vna eft ex lineis quaefitis; ponendo auiem AE =« a + j^ pundum F cadet vitra pundum A,
���A F D C B
nec proinde linea proderit ad hoc inflitutum, fed ad refiexiones insequales
Hîc, in fecundâ figura, fit vcriex lineae curvae G, ita
���lO
��VI BG major fit quàm BD. Ponendo AE ^ a +y, & BE ^ b + cy, fit
2(1 — ib ^
cujus quadratum, brevitatis caufâ, vocabiturArx; &fiet
DE ^ V^. - XX + ^^ry-byy+j^bcy--ia,y ^ ^
& fit pundum H centrum circuli tangentis curvam in pundo E, fiet
a. kE =^ a—y. hE = b -\- cy.
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