Answer:
Option 4. is the correct option.
Step-by-step explanation:
The given angles are π/2, 330°,5π/3, 7π/6, 2π/3.
we have to arrange these angle in decreasing order.
First we will convert these angles from radian to degree.
π/2 = 90°
5π/3 = 5×180/3 = 300°
7π/6 = 7×180/6 = 210°
2π/3 = 2×180/3 = 120°
and 330°
Now the decreasing order of the angles is
330°, 300°, 210°, 120°, 90°
Therefore 330°, 5π/3, 7π/6, 2π/3, π/2 is the correct answer.