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Convert 126° into radians.

Answer and explanation

Correct answer: 7π/10 radians

Answer: option C, 7π/10 radians. The fundamental relation is 180° = π radians. Therefore, to convert a degree measure into radians, multiply it by π/180. For 126°, we get 126 × π/180 = (126/180)π. Divide numerator and denominator by 18: 126/180 = 7/10. Hence 126° = 7π/10 radians. Option A, 5π/7, is not the simplified form of 126π/180. Option B, 3π/4, represents 135°, because (3π/4)×(180/π)=135°. Option C gives (7π/10)×(180/π)=126°, so it is correct. Option D also does not simplify from 126/180. The common confusion is reversing the conversion factor: π/180 changes degrees to radians, while 180/π changes radians to degrees. Memory cue: attach π/180 to a degree value.

Related tags

Angle ConversionDegrees To RadiansTrigonometric FunctionsSimplificationAnglesTrigonometric FunctionsMathematicsClass 12 Mcq

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