There is a circular path with a width of 1m outside a circular flower bed with a diameter of 9m. What is the area of this path?
在直径为9m的圆形花坛外面有一条宽1m的环形小路．问这条小路的面积是多少？
<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">(9/2) + 1</gadget>
<output>11/2 = around 5.5</output>

<gadget id="calculator">(11/2) ** 2</gadget>
<output>121/4 = around 30.25</output>

<gadget id="calculator">(9/2) ** 2</gadget>
<output>81/4 = around 20.25</output>

<gadget id="calculator">(121/4) - (81/4)</gadget>
<output>10</output>

<gadget id="calculator">3.14 * 10</gadget>
<output>31.4</output>

<result>31.4</result>