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If the terminal side of θ lies on the negative x-axis, what can be the value of θ between 0 and 2π?

Answer and explanation

Correct answer: π

The governing idea is the standard position of an angle. An angle is measured anticlockwise from the positive x-axis. A complete revolution measures 2π radians, and the negative x-axis is reached after half a revolution. Therefore, its principal angle in the interval 0 < θ < 2π is π radians. The terminal sides of π and 2π are different: π ends on the negative x-axis, whereas 2π returns to the positive x-axis. Likewise, π/2 ends on the positive y-axis and 3π/2 ends on the negative y-axis. Hence option B is correct. The axes are boundary lines, not quadrants, so this is an axis-location question rather than a quadrant-sign question.

Related tags

Trigonometric-FunctionsAnglesTerminal-SideAxis-RadianTrigonometric FunctionsMathematicsClass 12 Mcq

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