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प्रश्न
Find the number of right angles turned through by the hour hand of a clock when it goes from 10 to 1.
टीपा लिहा
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उत्तर
The hour hand of a clock revolves by 360º or 4 right angles in 1 complete round.
The hour hand of a clock revolves by 90º or 1 right angle when it goes from 10 to 1.
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