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On which axis does the angle 90° lie?

Answer and explanation

Correct answer: Positive y-axis

In standard position, an angle begins with its initial ray on the positive x-axis and is measured counterclockwise. A rotation of 90° is one quarter of a complete 360° revolution, so the terminal ray points vertically upward from the origin. The upward direction is the positive y-axis; therefore option C is correct. The positive x-axis corresponds to 0° or 360°, the negative x-axis to 180°, and the negative y-axis to 270°. The terminal ray at 90° lies exactly on an axis, not inside a quadrant. This standard-position sequence also rules out all three distractors.

Related tags

Trigonometric-FunctionsAnglesCoordinate-AxesTrigonometric FunctionsMathematicsClass 12 Mcq

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