A rope 15.7 meters long is wound 10 times around a big tree. What is the diameter of the big tree in meters?
用一根长15.7米的绳子在一棵大树上绕了10圈，这棵大树的直径是多少米？
<gadget id="calculator">15.7 / 10 / 3.14</gadget>
<output>0.5</output>

<result>0.5</result>