Xiao Ming and his father measure the diameter of the trunk of a big tree. After wrapping a 10-meter-long rope around the tree for 3 times, there is still 0.58 meters left. What is the diameter of the trunk of this big tree in meters?
小明和爸爸测量一棵大树树干的直径，用10米长的绳子在大树上绕了3圈后还剩0.58米，这棵大树树干的直径是多少米？
<gadget id="calculator">10 - 0.58</gadget>
<output>9.42</output>

<gadget id="calculator">9.42 / 3 / 3.14</gadget>
<output>1</output>

<result>1</result>