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Which is the positive coterminal angle of ( -780^\circ )?

Answer and explanation

Correct answer: \(300^\circ\)

Coterminal angles differ by an integral multiple of \(360^\circ\). Adding \(3\times360^\circ=1080^\circ\) to \(-780^\circ\) gives \(300^\circ\): \(-780^\circ+1080^\circ=300^\circ\). Hence, \(300^\circ\) is correct. \(240^\circ\) is not coterminal because \(240^\circ-(-780^\circ)=1020^\circ\), which is not a multiple of \(360^\circ\). Exam tip: Keep adding \(360^\circ\) to a negative angle until the least positive angle is obtained.

Related tags

Trigonometric FunctionsAnglesCoterminal AnglesDegree MeasurePositive AnglesMathematicsClass 12 Mcq

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