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What is the reference angle of −1190°?

Answer and explanation

Correct answer: 70°

The governing concept is the reference angle, defined as the positive acute angle between an angle’s terminal side and the x-axis. First find a coterminal angle in the standard interval from 0° to 360°: −1190° + 4(360°) = 250°. The angle 250° lies in quadrant III. In quadrant III, the reference angle is measured from 180°, so it is 250° − 180° = 70°. Therefore option D is correct. The values 10°, 20°, and 30° are not obtained from the coterminal-angle calculation. Adding 360° only once or three times would leave a negative angle, so adding four full revolutions is appropriate. The corrected option set now contains one unambiguous answer.

Related tags

Reference-AngleCoterminal-AnglesQuadrantsGrade-12AnglesTrigonometric FunctionsMathematicsClass 12 Mcq

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