At exactly one o’clock, the minute hand is at “12”, the hour hand is at “1”. There is only one division between these values. There are 12 of them on the dial. The circumference is 360 °. This means that if 360 °: 12 = 30 ° – the price of one division and the answer to the problem.
For example, at exactly 2 o’clock this angle will become 60 °, then at 3 o’clock – 90 °, and so on.
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