The radius of a circular fish pond is 10 meters, and a path with a width of 1 meter is paved around it. What is the perimeter of the path in meters?
一个圆形鱼池的半径是10米，在它的周围铺一条宽一米的小路，这条小路外沿的周长是多少米？
<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<gadget id="calculator">2 * 3.14 * 11</gadget>
<output>69.08</output>

<result>69.08</result>