The garden in the middle of the street is a circle with a diameter of 6 meters. Now it is necessary to build a circular path with a width of 1 meter around it. What is the area of the path in square meters?
街心花园是一个直径6米的圆形，现在要在它周围修一条1米宽的环形小路，小路的面积是多少平方米？
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">16 - 9</gadget>
<output>7</output>

<gadget id="calculator">3.14 * 7</gadget>
<output>21.98</output>

<result>21.98</result>