The minute hand of a clock is 20cm, how many centimeters is the distance which the minute hand runs along the clock once?
The minute hand of a clock is 20cm, how many centimeters is the distance which the minute hand runs along the clock once?
一只挂钟的分钟长20厘米，这根分钟的尖端转一周所走的路程是多少厘米？