A rope is 13 meters long, and after 10 turns around a big tree, there is still an extra 44 centimeters. What is the diameter of this big tree in centimeters?
一根绳子长13米，绕一棵大树10圈后还多出44厘米．这棵大树的直径是多少厘米？
<gadget id="calculator">13 * 100</gadget>
<output>1_300</output>

<gadget id="calculator">1_300 - 44</gadget>
<output>1_256</output>

<gadget id="calculator">1_256 / 10 / 3.14</gadget>
<output>40</output>

<result>40</result>