♡ Let’s look at the main important thing(s) that will lead you in the correct path.
♥ Remember that a triangle adds up to 180°. You already have the information of 2 angles (120°).
♡ Let's solve!
♥ Subtract 120° from 180° to find your answer:
180 - 120 = 60°.
If you have any further questions, do not hesitate to ask me!
-Lena