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時針的針端運行一圈的軌跡是一個圓(根據圓的定義可以知道),這個圓是以時針固定點為圓心,以時針長為半徑的圓.周長等於πr的平方. 時針轉一圈是12小時,一個晝夜就是兩圈,也就是兩倍的圓周長. 這樣講你有明白麼?
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