circular road with a width of 3 meters is paved around a circular lawn with a diameter of 8 meters. What is the area of the circular road?
在一个直径为8米的圆形草地周围铺一条宽3米的环形道路，求这条环形路的面积是多少？
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">7 ** 2</gadget>
<output>49</output>

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

<gadget id="calculator">49 - 16</gadget>
<output>33</output>

<gadget id="calculator">3.14 * 33</gadget>
<output>103.62</output>

<result>103.62</result>