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What is the principal coterminal angle of 1125°?

Answer and explanation

Correct answer: 45°

The governing concept is coterminal angles. Two angles are coterminal when their terminal sides coincide, so their difference must be an integral multiple of one full revolution, 360°. A principal angle in degrees is usually chosen in the interval 0° ≤ θ < 360°. Reduce 1125° by subtracting complete revolutions: 1125° − 3 × 360° = 1125° − 1080° = 45°. Thus 1125° and 45° have the same terminal side, making option C correct. The alternatives 15°, 30°, and 75° do not differ from 1125° by an integral multiple of 360°, so they represent different terminal positions. The calculation also confirms that the result lies in the required principal interval.

Related tags

Trigonometric-FunctionsAnglesPrincipal-AngleTrigonometric FunctionsMathematicsClass 12 Mcq

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