[551.] VIII.
[552.] IX.
[553.] X.
[554.] XI.
[555.] PROPOSITION I. Theoreme.
[556.] Demonstration.
[557.] Corollaire.
[558.] PROPOSITION II. Theoreme.
[559.] Demonstration.
[560.] Corollaire.
[561.] PROPOSITION III. Théoreme.
[562.] Demonstration.
[563.] Corollaire I.
[564.] Corollaire II.
[565.] PROPOSITION IV. Theoreme.
[566.] Demonstration.
[567.] Corollaire I.
[568.] Corollaire II.
[569.] Corollaire III.
[570.] Corollaire IV.
[571.] Corollaire V.
[572.] PROPOSITION V. Theoreme.
[573.] Demonstration.
[574.] Corollaire.
[575.] PROPOSITION VI. Theoreme.
[576.] Demonstration.
[577.] Corollaire.
[578.] PROPOSITION VII Théoreme.
[579.] Demonstration.
[580.] Corollaire I.