[31.] PROBLEMA 2. PROPOSITIO 8.
[32.] SCHOLIVM.
[33.] LEMMA.
[34.] LEMMA PRIMVM.
[35.] LEMMA II.
[36.] LEMMA PRIMVM.
[37.] LEMMA II.
[38.] THEOREMA 7. PROPOSITIO 9.
[39.] SCHOLIVM.
[40.] THEOREMA 8. PROPOSITIQ 10.
[41.] COROLLARIVM.
[42.] SCHOLIVM.
[43.] THEOREMA 9. PROPOSITIO 11.
[44.] SCHOLIVM.
[45.] COROLLARIVM PRIMVM.
[46.] COROLLARIVM II.
[47.] THEOREMA 10. PROPOSITIO 12.
[48.] COROLLARIVM.
[49.] THEOREMA 11. PROPOSITIO 13.
[50.] THEOREMA 12. PROPOSITIO 14.
[51.] SCHOLIVM.
[52.] THEOREMA 13. PROPOSITIO 15.
[53.] LEMMA.
[54.] COROLLARIVM.
[55.] THEOREMA 14. PROPOSITIO 16.
[56.] COROLLARIVM.
[57.] THEOREMA 15. PROPOSITIO 17.
[58.] LEMMA.
[59.] SCHOLIVM.
[60.] THEOREMA 16. PROPOSITIO 18.