circular pool with a radius of 4 meters is surrounded by a path with a width of 2 meters. What is the area of the path in square meters?
一个半径是4米的圆形水池，周围有一条2米宽的小路，这条小路的面积是多少平方米？
<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>