[81.] THEOREMA XV. PROPOS. XVIII.
[82.] COROLLARIVM.
[83.] THEOREMA XVI. PROPOS. XIX.
[84.] COROLLARIVMI.
[85.] COROLLARIVM II.
[86.] THEOREMA XVII. PROPOS. XX.
[87.] THE OREMA XVIII. PROPOS. XXI.
[88.] COROLLARIVM.
[89.] THEOREMA XIX. PROPOS. XXII.
[90.] COROLLARIVM I.
[91.] COROLLARIVM II.
[92.] LEMMA PRO ANTECED. PROP.
[93.] THEOREMA XX. PROPOS. XXIII.
[94.] COROLLARIVM.
[95.] THEOREMA XXI. PROPOS. XXIV.
[96.] COROLLARIVM.
[97.] THEOREMA XXII. PROPOS. XXV.
[98.] COROLLARIVM.
[99.] THEOREMA XXIII. PROPOS. XXVI.
[100.] THEOREMA XXIV. PROPOS XXVII.
[101.] COROLLARIVM.
[102.] THEOREMA XXV. PROPOS. XXVIII.
[103.] DEFINITIO.
[104.] SCHOLIV M.
[105.] LEMMA I.
[106.] LEMMA II.
[107.] LEMMA III.
[108.] LEMMA IV.
[109.] COROLLARIVM.
[110.] LEMMA V.