Use a 2-meter-long rope to measure the circumference of a big tree. After the rope is wound around the big tree for two weeks, it will be 0.43 meters longer. What is the diameter of the big tree in centimeters?
用一根2米长的绳子去测量一棵大树的周长，这根绳子在大树上绕两周后还多0.43米，这棵大树的直径是多少厘米？
<gadget id="calculator">2 - 0.43</gadget>
<output>1.57</output>

<gadget id="calculator">1.57 / 2 / 3.14</gadget>
<output>0.25</output>

<gadget id="calculator">0.25 * 100</gadget>
<output>25</output>

<result>25</result>