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What will be the principal coterminal angle of 52π/9?

Answer and explanation

Correct answer: 16π/9

Direct answer: C, 16π/9. Coterminal angles differ by an integer multiple of one complete revolution, 2π. The usual principal-angle interval here is [0,2π). Express 2π with denominator 9: 2π=18π/9. Subtract two complete revolutions from 52π/9: 52π/9−18π/9−18π/9=16π/9. This value is non-negative and less than 18π/9, so it lies in the required principal interval. A, 14π/9, is not obtained by subtracting an integral multiple of 18π/9 from 52π/9. B, 8π/9, and D, 2π/9, fail the same coterminality test. The intermediate result after one subtraction is 34π/9, but that is still larger than 2π, so stopping there is a mistake. Memory cue: reduce the coefficient of π modulo 18 when the denominator is 9.

Related tags

Principal-AngleCoterminal-AnglesRadiansTrigonometric-FunctionsAnglesTrigonometric FunctionsMathematicsClass 12 Mcq

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