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प्रश्न
Find the angle formed by the arms of a clock at 9 O’clock.
उत्तर
We know that sum of angles at a point = 360° and on the face of a clock there are 12 marks on it.
Now at 9 O’clock, the hour hand is on 9 while minute hand is at 12
∴ Angle between them `= 9/12 xx 360^circ = 270°`
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