In 2nd quadrant, the terminal side of this given angle lies.
What is angle?
When two lines are meet at a point, then the geometrical figure that is formed is called an angle.
The given angle is 5π/8 radians.
We know:
1st quadrant is from 0 to π/2 radians.
2nd quadrant is from π/2 radians to π radians.
3rd quadrant is from π radians to 3π/2 radians.
4th quadrant is from 3π/2 radians to 2π radians.
Therefore, the angle 5π/8 radians lies in the 2nd quadrant.
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