The circumference of a circular amusement park is 37.68 meters. When it was expanded later, the radius increased by 1 meter, and the area increased by how many square meters.
一个圆形游乐园的周长是37.68米，后来扩建时，半径增加1米，面积增加了多少平方米．
<gadget id="calculator">37.68 / 3.14 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 + 1</gadget>
<output>7</output>

<gadget id="calculator">7 ** 2</gadget>
<output>49</output>

<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

<gadget id="calculator">49 - 36</gadget>
<output>13</output>

<gadget id="calculator">3.14 * 13</gadget>
<output>40.82</output>

<result>40.82</result>