A rope with a length of 6.28 meters is exactly 10 times around the trunk. What is the approximate diameter of the cross-section of the trunk?
长6.28米的绳子，正好绕树干10圈．树干横截面的直径大约是多少米？
<gadget id="calculator">6.28 / 10 / 3.14</gadget>
<output>0.2</output>

<result>0.2</result>