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The minute hand, which is pointing at 3 is at right angles to 12. But the hour hand is no longer pointing at 12. The hour hand does not stay at 12 from 12:00 to 12:59 and then jump through 30 degrees at 1 o'clock. By 12:15, the hour hand has moved 7.5 degrees (clockwise) so at 12.15 the angle is 90-7.5 = 82.5 degrees.

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Q: Why the hands of a clock do not form a right angle at 1215 pm?
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