Build a gravel road with a width of 1 meter around a circular pool with a diameter of 2 meters. What is the area of the gravel road?
在一个直径是2米的圆形水池四周，修一条宽1米的石子路，这条石子路的面积是多少？
<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1</gadget>
<output>3.14</output>

<gadget id="calculator">1 + 1</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<gadget id="calculator">12.56 - 3.14</gadget>
<output>9.42</output>

<result>9.42</result>