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On which axis is the terminal side of 180°?

Answer and explanation

Correct answer: Negative x-axis

The governing idea is the standard position of an angle. The initial side begins on the positive x-axis, and positive angles are measured counterclockwise. A rotation of 180° is a half-turn, so the terminal ray points exactly opposite to the initial ray. The direction opposite the positive x-axis is the negative x-axis; therefore option B is correct. The standard axis positions provide a useful check: 0° or 360° lies on the positive x-axis, 90° lies on the positive y-axis, 180° lies on the negative x-axis, and 270° lies on the negative y-axis. Because 180° is an exact multiple of 90°, the terminal side is on an axis, not inside any quadrant. The other options correspond to 90°, 270°, and 0° or 360° respectively.

Related tags

Trigonometric-FunctionsAnglesTerminal-SideClass-12Trigonometric FunctionsMathematicsClass 12 Mcq

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