[51.] SCHOLION II.
[52.] SCHOLION III.
[53.] SCHOLION IV.
[54.] DEFINITIO XV.
[55.] CONSECTARIVM.
[56.] DEFINITIO XVI.
[57.] CONSECTARIVM.
[58.] SCHOLION.
[59.] DEFINITIO XVII.
[60.] SCHOLION I.
[61.] SCHOLION II.
[62.] SCHOLION III.
[63.] SCHOLION IV.
[64.] SCHOLION V.
[65.] THEOREMA.
[66.] CONSECTARIVM.
[67.] PROBLEMA I.
[68.] EXEMPLVM
[69.] PROBLEMA II.
[70.] EXEMPLVM I.
[71.] EXEMPLVM II.
[72.] EXEMPLVM III.
[73.] CONSECTARIVM.
[74.] SCHOLION I.
[75.] TABVLAE PERPENDICVLORVM ET BASIVM TRIANGVLI RECTANGVLI.
[76.] SCHOLION II. PROBLEMA III. RESOLVTIO PRIMA
[77.] RESOLVTIO SECVNDA
[78.] CONSECTARIVM.
[79.] PROBLEMA IV.
[80.] SCHOLION I.