There is a circular flower bed with a diameter of 100 meters in the park. A path with a width of 2 meters is built around the flower bed. What is the area of the path?
公园里有一个直径100米的圆形花坛，绕着花坛修一条2米宽的小路，小路的面积是多少？
<gadget id="calculator">100 / 2</gadget>
<output>50</output>

<gadget id="calculator">50 + 2</gadget>
<output>52</output>

<gadget id="calculator">52 ** 2</gadget>
<output>2_704</output>

<gadget id="calculator">50 ** 2</gadget>
<output>2_500</output>

<gadget id="calculator">2_704 - 2_500</gadget>
<output>204</output>

<gadget id="calculator">3.14 * 204</gadget>
<output>640.56</output>

<result>640.56</result>