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What is the coterminal angle of 390° between 0° and 360°?

Answer and explanation

Correct answer: 30°

Coterminal angles have the same terminal side and differ by an integral multiple of 360°, because 360° represents one complete revolution. Since the required representative must lie between 0° and 360°, reduce 390° by one full revolution: 390° − 360° = 30°. The result is within the stated interval, so option B is correct. Adding or subtracting another 360° would produce 390° or −330°, which do not satisfy the requested interval. Option A and option C do not preserve the terminal side of 390°, while option D is not obtained by a valid reduction. Thus 30° is the unique suitable coterminal angle.

Related tags

Trigonometric-FunctionsAnglesCoterminal-AnglesTrigonometric FunctionsMathematicsClass 12 Mcq

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