flower bed has a diameter of 4 meters, and there is a circular cobblestone path with a width of 2 meters around it. What is the area of the path in square meters?
一个花坛，直径4米，在它周围有一条宽2米的环形鹅卵石小路，小路的面积是多少平方米？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

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

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

<gadget id="calculator">16 - 4</gadget>
<output>12</output>

<gadget id="calculator">3.14 * 12</gadget>
<output>37.68</output>

<result>37.68</result>