A wheel rolls 10 times and advances 62.8 meters, what is its area?
一个车轮滚动10圈前进了62.8米，它的面积是多少？
<gadget id="calculator">62.8 / 10 / 3.14 / 2</gadget>
<output>1</output>

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

<gadget id="calculator">3.14 * 1</gadget>
<output>3.14</output>

<result>3.14</result>