Any other irrational number. 0.4 is rational (ie., it can be written as a fraction), but rational+irrational is always irrational.
So examples would be π or √2. If you add those, the result is irrational.
Sum of interior angles = 180(n - 2)
in this case n = 5 so 180(5-2) = 180(3) = 540
120 + 120 + x + x + x = 540
3x + 240 = 540
3x = 300
x = 100
answer
B) 100
A =>180-37=143
b=>90-37=53
c=90-53=37
