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If θ = 23π/5, in which quadrant will θ lie?

Answer and explanation

Correct answer: Second quadrant

The governing idea is reduction by complete revolutions. A full revolution is 2π, which equals 10π/5. Subtracting two complete revolutions, 4π = 20π/5, from the given angle gives 23π/5 − 20π/5 = 3π/5. We now compare this reduced angle with the quadrant boundaries: π/2 = 2.5π/5 and π = 5π/5. Since 2.5π/5 < 3π/5 < 5π/5, the terminal arm lies between π/2 and π, which is the second quadrant. Thus option B is correct. The angle is not in the third quadrant because it is less than π, and it is not in the first or fourth quadrant because it is greater than π/2 and less than π. The extra full revolutions do not change the terminal arm.

Related tags

QuadrantsCoterminal AnglesRadiansAnglesTrigonometric FunctionsMathematicsClass 12 Mcq

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