[31.] PROPOSITIO XV.

[32.] SCHOLIVM.

[33.] PROPOSITIO XVI.

[34.] SCHOLIVM.

[35.] PROPOSITIO XVII. Segmenti fupradicti conoidis hyperbolici centrum grauitatis reperire.

[36.] SCHOLIVM.

[37.] PROPOSITIO XVIII.

[38.] SCHOLIVM I.

[39.] SCHOLIVM II.

[40.] SCHOLIVM III.

[41.] PROPOSITIO XIX.

[42.] SCHOLIVM I.

[43.] SCHOLIVM II.

[44.] PROPOSITIO XX.

[45.] SCHOLIVM.

[46.] PROPOSITIO XXI.

[47.] PROPOSITIO XXII.

[48.] SCHOLIVMI.

[49.] SCHOLIVM II.

[50.] PROPOSITIO XXIII.

[51.] PROPOSITIO XXIV.

[52.] PROPOSITIO XXV.

[53.] PROPOSITIO XXVI.

[54.] SCHOLIVM I.

[55.] SCHOLIVM II.

[56.] SCHOLIVM III.

[57.] PROPOSITIO XXVII.

[58.] ALITER.

[59.] PROPOSITIO XXVIII.

[60.] SCHOLIVMI.