[321.] Solution.

[322.] PROPOSITION XII. Probleme.

[323.] Solution.

[324.] Demonstration.

[325.] Corollaire.

[326.] Fin du troiſieme Livre.

[327.] NOUVEAU COURS DE MATHÉMATIQUE. LIVRE QUATRIEME, Qui traite des propriétés des Triangles & des Parallelo-grammes. Définitions.

[328.] PROPOSITION I. Theoreme.

[329.] Demonstration.

[330.] Corollaire I.

[331.] Corollaire II.

[332.] Corollaire III.

[333.] Corollaire IV.

[334.] Definition.

[335.] PROPOSITION II. Theoreme.

[336.] Demonstration.

[337.] PROPOSITION III, Theoreme.

[338.] Demonstration.

[339.] PROPOSITION IV. Theoreme.

[340.] Demonstration.

[341.] PROPOSITION V. Theoreme.

[342.] Demonstration.

[343.] Corollaire.

[344.] PROPOSITION VI Theoreme.

[345.] Demonstration.

[346.] Corollaire I.

[347.] Corollaire II.

[348.] Corollaire III.

[349.] Corollaire IV.

[350.] PROPOSITION VII. Théoreme.