A circular flower bed is 16 meters in diameter, and a gravel path with a width of 2 meters is built around the flower bed. What is the area of the gravel path in square meters?
一个圆形花坛，直径是16米，围绕花坛修一条宽2米的石子路，这条石子路的面积是多少平方米？
<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>