Answer :
Final answer:
A clock has, in addition to the second hand, an hour hand and a minute hand that indicate the current hour and minute respectively. The hour hand's movement from 12 to 3 represents a passage of 3 hours which is 1/4 of a 12 hour cycle, or a 90 degree movement.
Explanation:
In a traditional clock, aside from the second hand which is the 'indicator hand', the other two hands are called the hour hand and minute hand. The hour hand, which is usually shorter and moves slower, points to the current hour. The minute hand, on the other hand, is longer and indicates the number of minutes past the hour. As an example, when the hour hand moves from 12 to 3, it represents a passage of 3 hours, or 1/4 of a 12 hour cycle. If you consider a complete revolution to represent a full circle (360 degrees), the angle between the hour hand at 12 and 3 is 1/4 of that, or 90 degrees.
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