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