| Singular | Plural | |
|---|---|---|
| Nominativ | trigon, trigonalis, trigon, trigoneis | trigones, trigones |
| Genitiv | trigonis, trigonis | trigonium, trigonium, trigonum, trigonum |
| Dativ | trigoni, trigoni, trigone | trigonibus, trigonibus |
| Akkusativ | triconem, trigonem | trigones, trigones |
| Ablativ | trigone, trigone | trigonibus, trigonibus |
| Vokativ | trigon, trigonalis, trigon, trigoneis | trigones, trigones |