Can a triangle be formed with the sides lengths of 10 cm, 2 cm and 12 cm?

No, you cannot make a triangle with these sidelenghts

Step-by-step explanation:

a triangles sidelenghts are more than the difference of the other two, but less than the summ of the other two

10 is equal to 10, but less than 14

2 is equal to 2, but less than 22

12 is greater than 8, but equal to 12