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Question
Find the angle formed by the arms of a clock at 3 O’clock.
Solution
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 3 O’clock, the hour hand is on 3 while minute hand is at 12
∴ Angle between them `= 3/12 xx 360^circ`
= 3 × 30° = 90°
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