| Singular | Plural | |
|---|---|---|
| Nominativ | triangulum, triangulum, triangulom, triangulom | triangula, triangula |
| Genitiv | trianguli, trianguli | triangulorum, triangulorum, triangulum, triangulum |
| Dativ | triangulo, triangulo | triangulis, triangulis |
| Akkusativ | triangulum, triangulum | triangula, triangula |
| Ablativ | triangulo, triangulo | triangulis, triangulis |
| Vokativ | triangulum, triangulum | triangula, triangula |