rope is 10 meters long. After wrapping it around a big tree 3 times, there is 0.58 meters left. What is the diameter of this large tree in decimeters?
一根绳子长10米，用它在一棵大树上绕了3圈后，还剩0.58米．这棵大树的直径是多少分米？
<gadget id="calculator">10 - 0.58</gadget>
<output>9.42</output>

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

<gadget id="calculator">1 * 10</gadget>
<output>10</output>

<result>10</result>