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What is the least positive coterminal angle of (1490^\circ)?

Answer and explanation

Correct answer: \(50^\circ\)

Coterminal angles differ by an integral multiple of \(360^\circ\). Subtract the greatest suitable multiple of \(360^\circ\): \(1440^\circ=4\times360^\circ\). Thus, \(1490^\circ-1440^\circ=50^\circ\). Therefore, the least positive coterminal angle is \(50^\circ\). Although \(40^\circ\) is a close distractor, it does not differ from \(1490^\circ\) by a whole multiple of \(360^\circ\). Exam tip: divide the angle by \(360^\circ\) and take the positive remainder.

Related tags

Trigonometric FunctionsCoterminal AnglesDegree MeasureAngle ReductionAnglesMathematicsClass 12 Mcq

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