There is a circular lawn with a diameter of 8 meters in the park. If a path with a width of 1 meter is built along the perimeter of the lawn, what is the area of the path in square meters?
公园有一块直径是8米的圆形草坪，如果沿着草坪的周围修一条1米宽的小路，这条路的面积是多少平方米？
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

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

<gadget id="calculator">25 - 16</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<result>28.26</result>