A 22-meter-long rope is wound 10 times around a tree, and there is still 2 cm left. What is the cross-sectional area of the tree?
一条长22米的绳子，在一棵树上绕了10圈后，还剩2厘米，这棵树的横截面的面积是多少？
<gadget id="calculator">22 * 100</gadget>
<output>2_200</output>

<gadget id="calculator">2_200 - 2</gadget>
<output>2_198</output>

<gadget id="calculator">2_198 / 10 / 3.14 / 2</gadget>
<output>35</output>

<gadget id="calculator">35 ** 2</gadget>
<output>1_225</output>

<gadget id="calculator">3.14 * 1_225</gadget>
<output>3_846.5</output>

<result>3_846.5</result>