The diameter of a circular flower bed is 8 meters, and a 2-meter-wide path is paved around it. What is the area of this path in square meters?
一个圆形花坛的直径是8米，在它的四周铺一条2米宽的小路，这条小路面积是多少平方米．
<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>