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What is the reference angle of 7π/5?

Answer and explanation

Correct answer: 2π/5

The governing concept is the reference angle, defined as the positive acute angle between a terminal side and the x-axis. To locate 7π/5, compare it with π = 5π/5 and 3π/2 = 7.5π/5. Thus 7π/5 lies in the third quadrant. For a third-quadrant angle θ, the reference angle is θ − π. Therefore α = 7π/5 − 5π/5 = 2π/5. This value is positive and less than π/2, so it satisfies the definition. Hence option B is correct. The expression 2π − θ belongs to the fourth-quadrant case and would be inappropriate here; the other options do not give the required acute angle.

Related tags

AnglesReference-AngleRadiansQuadrantsTrigonometric FunctionsMathematicsClass 12 Mcq

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