Xiaojun used a 30-meter-long rope to measure the diameter of a tree, and wound it 10 times around the trunk to get 1.74 meters more. What is the diameter of this tree in meters?
小军用一根30米长的绳子测一棵树的直径，在树干上绕了10圈多了1.74米．这棵树的直径大约多少米？
<gadget id="calculator">30 - 1.74</gadget>
<output>28.26</output>

<gadget id="calculator">28.26 / 10 / 3.14</gadget>
<output>0.9</output>

<result>0.9</result>