15. Find the number of right angles turned through by the hour of a clock when
it goes from 4 to 1
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The hour hand of a clock revolves by 360° or 4 right angles in one complete round. (a) The hour hand of clock revolves by 90° or one right angle when it goes from 3 to 6. (b) The hour hand of clock revolves by 180° or 2 right angles when it goes from 2 to 8.
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