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If 540° and θ are coterminal and 0° ≤ θ < 360°, what is θ?

Answer and explanation

Correct answer: 180°

Coterminal angles have the same terminal side and differ by an integral multiple of 360°, since 360° represents one complete revolution. The question asks for the representative satisfying 0° ≤ θ < 360°. Subtract one complete revolution from 540°: 540° − 360° = 180°. This result is nonnegative and smaller than 360°, so it meets the required interval and is the desired value of θ. Therefore option C is correct. Subtracting 360° once more would produce −180°, which is outside the interval. The alternatives 90°, 120°, and 270° are not coterminal with 540°, because their differences from 540° are not integer multiples of 360°. Thus the principal degree representative is 180°.

Related tags

Coterminal AnglesDegreesPrincipal AngleAnglesTrigonometric FunctionsMathematicsClass 12 Mcq

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