The station square is a rectangle with a length of 400 meters and a width of 300 meters. There is a circular flower bed at the northeast corner of the square. Its diameter is 20 meters and the height of the flower bed is 0.5 meters. The granite path is for people to enjoy flowers, how many square meters is the area of the path?
车站广场是一个长400米，宽300米的长方形，在广场的东北角有一个圆形花坛，它的直径是20米，花坛的高是0.5米，车站决定沿花坛外侧铺一条2米宽的花岗石小路供人们赏花，求小路的面积是多少平方米？
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 + 2</gadget>
<output>12</output>

<gadget id="calculator">12 ** 2</gadget>
<output>144</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">144 - 100</gadget>
<output>44</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3.14 * 44 * (1/4)</gadget>
<output>34.54</output>

<result>34.54</result>