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Which is a negative coterminal angle of 120°?

Answer and explanation

Correct answer: −240°

Coterminal angles have the same terminal side and differ by an integer multiple of 360°. To obtain a negative angle from 120°, subtract one full revolution: 120° − 360° = −240°. Therefore option B is correct. Adding or subtracting 360° preserves the terminal side, so −240° is coterminal with 120°. Option A is positive and is not obtained by a 360° multiple from 120°; −120° differs by 240°, not 360°; and 480° is positive, although it is a positive coterminal angle because 120° + 360° = 480°. The word negative is essential.

Related tags

Trigonometric-FunctionsAnglesCoterminal-AnglesClass-12Trigonometric FunctionsMathematicsClass 12 Mcq

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