[671.] PROPOSITION XI. Probleme.

[672.] PROPOSITION XII. Probleme.

[673.] CHAPITRE II. Qui traite de l’Ellipſe. Definitions.

[674.] PROPOSITION I. Theoreme.

[675.] Démonstration.

[676.] Corollaire I.

[677.] Corollaire II.

[678.] Corollaire III.

[679.] Remarque I.

[680.] Remarque II.

[681.] Definitions. I.

[682.] II.

[683.] III.

[684.] IV.

[685.] Corollaire.

[686.] PROPOSITION II. Theoreme.

[687.] Démonstration.

[688.] Corollaire.

[689.] PROPOSITION III. Théoreme.

[690.] Demonstration.

[691.] Corollaire I.

[692.] Corollaire II.

[693.] Corollaire III.

[694.] Corollaire IV.

[695.] PROPOSITION IV. Theoreme.

[696.] Demonstration.

[697.] Corollaire.

[698.] PROPOSITION V. Theoreme.

[699.] Demonstration.

[700.] Corollaire.