( i don't know what exactly this means but i translated it : d )
Answer from: Quest
corras is the only one that is informal but doesn't follow the suffix rule. correr is the verb. corre is the formal verb form. corra would be used as the formal is corre ended with an a.
your best bet would be corras, it's the only one that is informal but is still wrong
En un triangulo rectangulo, el cateto largo mide 7 unidades mas que el corto a su vez la hipotwnusa mide 1 unidad mas que el cateto que area tiene dicho trangulo