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Which is the coterminal angle of -1000° between 0° and 360°?

Answer and explanation

Correct answer: 80°

The governing concept is that coterminal angles differ by an integral multiple of 360°. We need to add enough complete turns to the negative angle so that the result lies in the interval from 0° to 360°. Add 360° three times: -1000° + 360° = -640°, then -640° + 360° = -280°, and finally -280° + 360° = 80°. Equivalently, -1000° + 1080° = 80°, where 1080° is 3 × 360°. Since 80° lies in the required interval, option B is correct. Options A, C, and D do not result from the required 360° adjustment and therefore are not coterminal with -1000°.

Related tags

Trigonometric-FunctionsAnglesCoterminal-AnglesTrigonometric FunctionsMathematicsClass 12 Mcq

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