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A particle moves \( \frac{9\pi}{4} \) radians on a circle. Its terminal side is coterminal with which standard angle?

Answer and explanation

Correct answer: \( \frac{\pi}{4} \)

Coterminal angles have the same terminal side because they differ by an integral multiple of \(2\pi\). Here, \(\frac{9\pi}{4}-2\pi=\frac{9\pi}{4}-\frac{8\pi}{4}=\frac{\pi}{4}\). Therefore, the terminal side is coterminal with \(\frac{\pi}{4}\). Although \(\frac{\pi}{2}\) may seem close, it represents \(90^\circ\), whereas \(\frac{\pi}{4}=45^\circ\). Exam tip: reduce an angle to the interval \([0,2\pi)\) by adding or subtracting \(2\pi\) as needed.

Related tags

Trigonometric FunctionsCoterminal AnglesStandard AnglesRadiansAngle ReductionAnglesMathematicsClass 12 Mcq

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