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Which is the principal coterminal angle of 31π/3?

Answer and explanation

Correct answer: π/3

The governing concept is reduction of a radian measure to its principal coterminal angle. Coterminal angles differ by an integral multiple of 2π, since 2π radians represents one complete revolution. The principal representative is normally chosen in the interval 0 ≤ θ < 2π. Rewrite one revolution as 2π = 6π/3. Since 31π/3 = 30π/3 + π/3 = 5(2π) + π/3, removing five complete revolutions leaves π/3. This value is positive and smaller than 2π, so it satisfies the principal-angle interval. Therefore option B is correct. The other choices are different positions within the same interval and are not obtained from 31π/3 by subtracting an integral multiple of 2π; hence they are not coterminal with the given angle.

Related tags

Trigonometric-FunctionsAnglesCoterminal-AnglesRadian-MeasureTrigonometric FunctionsMathematicsClass 12 Mcq

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