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What do we get by converting π/20 radians into degrees?

Answer and explanation

Correct answer: 9°

Answer: option A, 9°. The basic conversion is π radians = 180°. Therefore, to convert radians into degrees, multiply by 180°/π. For π/20 radians, the calculation is (π/20) × (180°/π). The π in the numerator and denominator cancels, leaving 180°/20 = 9°. Thus π/20 radians equals 9°, so option A is correct. Option B, 10°, would come from dividing 180 by 18 rather than 20. Option C, 12°, corresponds to π/15 radians, not π/20. Option D, 18°, corresponds to π/10 radians. The safest method is to write the conversion factor with units so that radians cancel. Do not use π/180 here: that factor converts degrees to radians and would reverse the requested direction. Memory cue: a fraction of π radians is the same fraction of 180°; one-twentieth of 180° is 9°.

Related tags

Radian To DegreeAngle ConversionTrigonometric FunctionsUnit ConversionAnglesTrigonometric FunctionsMathematicsClass 12 Mcq

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