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What is the principal coterminal angle of -1430°?

Answer and explanation

Correct answer: 10°

A principal coterminal angle in this question is the representative between 0° and 360°. Coterminal angles are obtained by adding or subtracting integer multiples of 360°. Starting with -1430°, add 4 × 360° = 1440°: -1430° + 1440° = 10°. The result is positive and is less than 360°, so it satisfies the required principal interval. Therefore, option D is correct. The tempting values 350°, 20°, and 30° are not equal to -1430° plus an integral multiple of 360°. For example, the nearest adjustment using 3 turns gives -350°, not a principal positive representative; one additional turn gives 10°.

Related tags

Trigonometric-FunctionsAnglesPrincipal-Coterminal-AngleTrigonometric FunctionsMathematicsClass 12 Mcq

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