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Through how many radians does the minute hand turn from 4:12 to 4:47?

Answer and explanation

Correct answer: 7π/6

The minute hand moves at a constant rate, completing one full circle in 60 minutes. A full circle measures 360 degrees, or 2\(\pi\) radians. Therefore, the angle turned depends on the fraction of an hour represented by the elapsed minutes. Only the time difference matters; the starting clock hour does not change the calculation.

From 4:12 to 4:47, the elapsed time is \(47-12=35\) minutes. The fraction of a complete revolution is \(35/60\), so the angle is \((35/60)\times2\pi=70\pi/60=7\pi/6\) radians. Hence option C is correct. Option A represents only 25 minutes, while option B represents 30 minutes, so neither matches the stated interval.

Related tags

Radian-MeasureTrigonometric-FunctionsClock-AngleAngular-DisplacementAnglesTrigonometric FunctionsMathematicsClass 12 Mcq

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