| Singular | Plural | |
|---|---|---|
| Nominativ | trigonom, trigonom, trigonum, trigonum | trigona, trigona |
| Genitiv | trigoni, trigoni | trigonorum, trigonorum |
| Dativ | trigono, trigono | trigonis, trigonis |
| Akkusativ | trigonum, trigonum | trigona, trigona |
| Ablativ | trigono, trigono | trigonis, trigonis |
| Vokativ | trigonum, trigonum | trigona, trigona |