There is a semicircular flower bed with a diameter of 20 meters in the Civic Square, and there is a 2-meter-wide cobble stone path along the arc of the flower bed. How many square meters is the area of this path?
市民广场有一个直径为20米的半圆形花坛，靠着花坛圆弧有一条2米宽的鹅孵石小路，这条小路的面积为多少平方米？
<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">44 / 2</gadget>
<output>22</output>

<gadget id="calculator">3.14 * 22</gadget>
<output>69.08</output>

<result>69.08</result>