Answer:
I got youuuu
Step-by-step explanation: what you need?

Actually Welcome to the Concept of the Differential Calculus.
Since, we know this is a definite calculus,
thus we get here as, by using the Chain Rule.
Number of angles = number of sides
180 - 120 = 60 (calculating the exterior angle)
360 / 60 = 6
There are 6 sides.
Hope this helps! :)
Seriously nobody knows the anwser?? Im done ill just fail
Answer: The answer will be created shortly.