The diameter of a circular flower bed is 20 meters, and a path with a width of 1 meter is built around it on the outer edge. What is the area of this path in square meters?
一个圆形花坛的直径是20米，绕着它的周围在外沿修一条宽为1米的小路，这条小路的面积是多少平方米？
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<gadget id="calculator">11 ** 2</gadget>
<output>121</output>

<gadget id="calculator">3.14 * 121</gadget>
<output>379.94</output>

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

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<gadget id="calculator">379.94 - 314</gadget>
<output>65.94</output>

<result>65.94</result>