Full text: Barrow, Isaac: Lectiones Opticæ & Geometricæ

= Z; erit curva AGF _Circulus_; & curva AB =
{AD 2}+{DL/2 AK}arc. KL.

43.1.

Fig. 163.

3. Sit linea KL _Hyperbola æquilatera_, cujus _Centrum_ A, & _Axis_ AK = Z; erit CGE recta linea; & curva AB
_Parabola._

43.1.

Fig. 164.

4. Sit Linea KL _Parabola_ (cujus axis AD) erit curva CG E
quoque _Parabola_; & curva AB _Paraboliformium_ quæ-
dam.

43.1.

Fig. 163.

5. Sit curva KL _Paraboliformis_ quædam inverſa, vel infini-
ta (talis ſcilicet ut ſit FH = √{Z3/AF}) erit curva AB _Cyclo-_
_is_, ad _circulum_ pertinens, cujus _Diameter_ ipſi Z æqua-
tur.

43.1.

Fig. 165.

Elegantiora forſan _Exempla_ ipſe circumſpectans excogitabis.

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