| Nominativ | trigonum, trigonum, trigonus, trigona, trigona, trigonus | trigoni, trigonae, trigonae, trigoni, trigona, trigona |
| Genitiv | trigoni, trigonae, trigonae, trigoni, trigoni, trigoni | trigonorum, trigonorum, trigonorum, trigonorum, trigonarum, trigonarum |
| Dativ | trigonae, trigonae, trigono, trigono, trigono, trigono | trigonis, trigonis, trigoneis, trigoneis |
| Akkusativ | trigonam, trigonam, trigonum, trigonum, trigonum, trigonum | trigona, trigona, trigonos, trigonos, trigonas, trigonas |
| Ablativ | trigono, trigono, trigona, trigona, trigono, trigono | trigonis, trigonis, trigoneis, trigoneis |
| Vokativ | trigonum, trigonum, trigone, trigone, trigona, trigona | trigoni, trigonae, trigonae, trigoni, trigona, trigona |
