The diagram shows that if you draw a straight line through the points denoting 12 and 6 o’clock, and draw a straight line perpendicular to it through the points designated as 9 and 3 o’clock, then they form a right angle (between 9 and 12 o’clock). Every 3 hours equals 90 degrees.
90/3 = 30 – it turns out that 1 hour is equal to 30 degrees.
Based on the position of the hands showing exactly 8 o’clock, an angle of 4 o’clock is obtained. Consequently, the minute and hour hands in this position form an angle of 120 degrees:
4 * 30 = 120
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