The circular fountain in Jincheng Square has a diameter of 8 meters. Due to the renovation, the fountain needs to be expanded by 2 meters. How many square meters has the area of the fountain increased?
金城广场的圆形喷水池，直径8米，由于整修，要将这个喷水池向外扩宽2米，这个喷水池的面积增加了多少平方米？
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 + 2</gadget>
<output>6</output>

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

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">36 - 16</gadget>
<output>20</output>

<gadget id="calculator">3.14 * 20</gadget>
<output>62.8</output>

<result>62.8</result>