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If \(\theta=-315^\circ\) then what is its coterminal angle in \(0^\circ\le\theta<360^\circ\)?

Answer and explanation

Correct answer: \(45^\circ\)

Coterminal angles have the same terminal side, so they differ by an integral multiple of \(360^\circ\). Thus, \(-315^\circ+360^\circ=45^\circ\), and \(45^\circ\) lies in the required interval \(0^\circ\le\theta<360^\circ\). Although \(30^\circ\) is nearby, it does not differ from \(-315^\circ\) by a whole multiple of \(360^\circ\). Exam tip: to express a negative angle in this interval, first add \(360^\circ\).

Related tags

Trigonometric FunctionsCoterminal AnglesAnglesPrincipal AngleDegree MeasureMathematicsClass 12 Mcq

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