[661.] Demonstration.
[662.] Corollaire I.
[663.] Corollaire II.
[664.] Corollaire III.
[665.] PROPOSITION VIII. Theoreme.
[666.] Demonstration.
[667.] Corollaire.
[668.] PROPOSITION IX. Probleme.
[669.] PROPOSITION X. Probleme.
[670.] Demonstration.
[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.