[751.] IX.

[752.] Calcul des Triangles rectangles. PROPOSITION I. Probleme.

[753.] PROPOSITION II. Probleme.

[754.] PROPOSITION III. Probleme.

[755.] PROPOSITION IV. Probleme.

[756.] PROPOSITION V. Probleme.

[757.] PROPOSITION VI. Theoreme.

[758.] Démonstration.

[759.] PROPOSITION VII. Theoreme.

[760.] Demonstration.

[761.] PROPOSITION VIII. Probleme.

[762.] Lemme.

[763.] Demonstration.

[764.] PROPOSITION IX. Probleme.

[765.] PROPOSITION X. Theoreme

[766.] Demonstration.

[767.] PROPOSITION XI. Probleme.

[768.] PROPOSITION XII. Theoreme.

[769.] Demonstration.

[770.] PROPOSITION XIII. Probleme.

[771.] Uſages des Logarithmes pour le calcul des Triangles.

[772.] Exemple I.

[773.] Exemple II.

[774.] Exemple III.

[775.] Application de la Trigonometrie a la pratique. PROPOSITION XIV. Probleme.

[776.] Remarque.

[777.] PROPOSITION XV. Probleme.

[778.] Remarque generale.

[779.] PROPOSITION XVI. Probleme.

[780.] PROPOSITION XVII. Probleme.