There is a circular flower bed with a diameter of 40 meters, and a path with a width of 2 meters is paved around it. What is the area of the path in square meters?
有一个圆形花坛，直径为40米，在它周围铺一条宽为2米的小路，小路的面积是多少平方米？
<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">20 + 2</gadget>
<output>22</output>

<gadget id="calculator">22 ** 2</gadget>
<output>484</output>

<gadget id="calculator">20 ** 2</gadget>
<output>400</output>

<gadget id="calculator">484 - 400</gadget>
<output>84</output>

<gadget id="calculator">3.14 * 84</gadget>
<output>263.76</output>

<result>263.76</result>