A rope is 6.28 meters long and is wrapped around a log for exactly 4 turns. What is the diameter of the cross section of the log?
一根绳子长6.28米，缠在一根圆木上，刚好绕4圈，这根圆木的横截面的直径是多少？
<gadget id="calculator">6.28 / 4 / 3.14</gadget>
<output>0.5</output>

<result>0.5</result>