circular road with a width of 2 meters is paved around a circular lawn with a diameter of 16 meters. What is the area of the circular road?
在一个直径为16米的圆形草地周围铺一条宽2米的环形道路，求这条环形路的面积是多少？
<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">8 + 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">8 ** 2</gadget>
<output>64</output>

<gadget id="calculator">100 - 64</gadget>
<output>36</output>

<gadget id="calculator">3.14 * 36</gadget>
<output>113.04</output>

<result>113.04</result>