Xiao Ming wants to know the diameter of a big tree in the community. He wraps a 20-meter-long rope around the trunk 6 times, and there is 1.16 meters left. What is the diameter of the trunk in meters?
小明想知道小区里一棵大树的直径，他用一条长20米的绳子围绕一棵树干绕了6圈，还余下1.16米，这棵树干的直径大约是多少米？
<gadget id="calculator">20 - 1.16</gadget>
<output>18.84</output>

<gadget id="calculator">18.84 / 6 / 3.14</gadget>
<output>1</output>

<result>1</result>