| Nominativ | triangula, triangulus, triangula, triangulus, triangulum, triangulum | trianguli, trianguli, triangula, triangula, triangulae, triangulae |
| Genitiv | trianguli, trianguli, trianguli, trianguli, triangulae, triangulae | triangulorum, triangulorum, triangulorum, triangulorum, triangularum, triangularum |
| Dativ | triangulo, triangulo, triangulo, triangulo, triangulae, triangulae | triangulis, triangulis |
| Akkusativ | triangulum, triangulum, triangulum, triangulam, triangulam, triangulum | triangula, triangula, triangulos, triangulos, triangulas, triangulas |
| Ablativ | triangula, triangula, triangulo, triangulo, triangulo, triangulo | triangulis, triangulis |
| Vokativ | triangula, triangula, triangule, triangulum, triangule, triangulum | trianguli, trianguli, triangula, triangula, triangulae, triangulae |
