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If \(\theta=\frac{13\pi}{4}\), what is the principal angle of \(\theta\)?

Answer and explanation

Correct answer: \(\frac{5\pi}{4}\)

To find the principal angle, reduce the angle to the interval \([0,2\pi)\). Since \(2\pi=\frac{8\pi}{4}\), \(\frac{13\pi}{4}-2\pi=\frac{13\pi}{4}-\frac{8\pi}{4}=\frac{5\pi}{4}\). Hence, the principal angle is \(\frac{5\pi}{4}\). \(\frac{\pi}{4}\) is the reference angle, not the principal angle. Exam tip: add or subtract multiples of \(2\pi\) until the angle lies in \([0,2\pi)\).

Related tags

Trigonometric FunctionsPrincipal AngleCoterminal AnglesRadiansClass 11 MathematicsAnglesMathematicsClass 12 Mcq

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