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What is the smaller angle between the hour and minute hands at 7:38?

Answer and explanation

Correct answer: 1°

The governing concept is the continuous angular motion of both clock hands. The minute hand moves 6° per minute, so at 38 minutes its position is 38 × 6 = 228°. The hour hand moves 30° per hour and also advances 0.5° per minute. At 7:38, its position is 7 × 30 + 38 × 0.5 = 210 + 19 = 229°. The difference is |229 − 228| = 1°. Since this difference is already less than 180°, it is the smaller angle. Therefore option A is correct. Treating the hour hand as fixed exactly at 7 would ignore its 19° movement and produce a misleading result. The calculation must account for both hands’ positions at the same instant.

Related tags

AnglesClock-AngleDegree-MeasureTrigonometryTrigonometric FunctionsMathematicsClass 12 Mcq

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