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��Opuscula Posthuma.
��i5.
��XII.
Earvmdem octo Vertiges, horvmqve Vsvs.
Porro, ad enumerandas omnes fpecies lineae curvae, quse refradiones ab vno pundo ad aliud difponit, fup- pono femper a majus quàm b, & c quàm d, & facio :
I 2
A E =« a — dy, & Bï. ^ b + cy vel b — cy; deinde A E =« a — cj, & "Qï. ^ b + dy \e\ b — dy,
5 6
& A E =x» a 4- dy, & B E =« ^ + cj vel ^ — cy;
7 8
tandem kï. ^ a -\- cy, & BE ^ b + dy \e\ b — dy.
Hîc itaque funt 8 capita, ad qubrum vnumquodque confiderandum an C, vertex curvae, fit inter A & B, vel B inter A & C, ac etiam an curvatura lineae adfpi- ciat verfus A, vel contra.
CeftinterA&B.
Pro I" capite, D cadet inter A & C, eritque
E
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��■ 5
�� ��cujus quadratum vocetur xx, eritque
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